高考英语单项选择分类训练：定语从句

这是一份高考英语单项选择分类训练：定语从句，共19页。
单项选择：定语从句
1．William Hastie once suggested that history informs us of past mistakes ________ we can learn without repeating them.
A．of whom B．about which C．from which D．by whom
2．It was April 29, 2001 ________ Prince William and Kate Middleton walked into the palace hall of the wedding ceremony.
A．that B．when C．since D．before
3．Have you ever had a case ________ someone accused your journalist of getting the wrong end of the stick?
A．as B．when C．where D．which
4．We have entered an age ________ dreams have the best chance of coming true.
A．when B．that C．which D．what
5．When I was young, my parents gave me an upbringing prepared me for the life challenges most of us have to face later in life.
A．that B．what C．where D．whose
6．The GPNP is intended to provide stronger protection for all the species ________ live within the Giant Panda Range and significantly improve the health of the ecosystem in the area.
A．who B．where C．which D．that
7．Recently they have been developing a new kind of drug, ________ effects we are greatly concerned.
A．to whose B．about whose C．to which D．about which
8．Generally speaking, the generation gap is actually a technology gap, ________ children update themselves on the latest technology while parents drop behind.
A．where B．when C．which D．that
9．There are occasions ________ backpackers are so tired that they fall asleep almost anywhere.
A．when B．where C．which D．that
10．He is confident, ________, in my opinion, is most important in modern society.
A．who B．which C．that D．what
11．The book I’d like to recommend is Fu Lei’s Family Letters, ________ Fu Lei shared his views about art and life.
A．that B．which C．where D．who
12．I have many friends, some are businessmen.
A．of them B．from which
C．of whom D．who of
13．There are altogether fifty-­four students in our class, is a newcomer from a faraway mountain village.
A．the most diligent of who
B．but the most diligent of whom
C．the most diligent of them
D．of whom the most diligent
14．The reason________ she didn’t get the job was________ her English was not very good.
A．which; that B．why; that
C．why; because D．that; because
15．Is this the reason ________ at the meeting for the carelessness in the work?
A．he explained B．what he explained
C．how he explained D．why he explained
16．How I regretted ________ hard at school, ________ led to the failure in my career!
A．not to study; which B．not having studied; that
C．not having studied; which D．not to study; that
17．Is this a case _____ knowing the facts actually would be worse than not knowing?
A．where B．that C．when D．which
18．There are some cases ________ this rule does not hold good.
A．that B．which C．when D．where
19．_____is known to everybody，she is well ­known for her beautiful songs.
A．It B．As
C．That D．What
20．________ we all know, the beauty of calligraphy consists in the inner peace ________ you experience Chinese brilliant culture.
A．As; in which B．As; when
C．That; what D．That; where.
21．The book discusses the extent ________ family life has changed over the past 50 years.
A．where B．in which C．to which D．that
22．These terraces were built by the local Zhuang and Yao people, Guangxi is home.
A．for which B．for whom C．to which D．to whom
23．As is known to every student in Shuang Ling Middle School, patience is a quality ________ success feeds on itself.
A．where B．what C．that D．which
24．Scientist are learning more every day about the secret ways ______ plants talk to each other.
A．to which B．for which C．in which D．on which
25．People sit uncomfortably on plastic chairs, looking through old magazines,________have been read hundreds of times previously.
A．all of them B．each of which C．all of which D．each of them
26．________is often the case all over the world with new areas of economic activity, the sharing economy is developing faster than existing regulations.
A．As B．That C．It D．Which
27．To learn English well, you should put yourself in situations________ you’ll be forced to communicate in English.
A．when B．how C．where D．that
28．The place the bridge is supposed to be built should be the cross-river traffic is the heaviest.
A．which, that B．at which,where
C．at which,that D．where, in which
29．Among the countries listed in the 2021 World Happiness Report, those at the bottom were mainly underdeveloped countries ______ issues such as political conflicts have been widespread in recent years.
A．that B．where C．what D．when
30．He was driving so fast as to get himself into a dangerous situation _______ he is likely to lose the control over his car.
A．which B．that C．where D．when
31．My cellphone, ________ I couldn’t contact my parents, was taken away by my teacher for the reason ________ I had used it in my English class.
A．which, why B．with which, that C．without which, why D．without which, that
32．After working for 10 years, I find teaching is a job ___________you are doing something serious but interesting.
A．that B．which C．when D．where
33．Could it be in the restaurant ______ you had dinner with your partner yesterday ______ you lost your handbag?
A．which; that B．where; that C．that; which D．that; where
34．A war is so cruel that it always causes great losses, _____ has happened in Ukraine and other countries.
A．what B．as C．where D．which
35．The reason________he didn’t show up at the party is________he was ill.
A．why; that B．that; because C．why; because D．which; for
36．The worsening living conditions on the Carteret Islands finally resulted in________we called the relocation of all the islanders, from________arose the problem of losing their traditions and celebrations.
A．which; what B．which; which C．what; that D．what; which
37．It is going to be some time________he sees his father again,________ business has just been set up in the UK.
A．before; his B．until; his
C．before; whose D．until; whose
38．It is one of the most surprising moments in Oscar history________actor Will Smith walked on stage and slapped Chris Rock for a joke________Rock made about Smith’s wife's hair.
A．which; that B．that; when C．when; that D．which; which
39．________was beyond their expectation was that they finally reached a place________sold drinks and other small articles.
A．It; which B．It; where C．What; which D．What; where
40．The police found the two “stolen” notebooks were left in a gift bag________the original blue box________the notebooks were kept in and a brown envelope.
A．containing; where B．to contain; which C．containing; / D．to contain; that
41．These days, teachers have been sparing no efforts to create they hope will be the best means to improve the efficiency of online teaching, some students don’t notice or care about, though.
A．that, which B．what, which C．which, what D．what, that
42． It is suggested at the end of the passage the things we buy often affect many people’s lives around the world.
A．that, what B．which, / C．that, / D．what, that
43．Was it in the village ______ we used to live in ______ the accident happened?
A．that; where B．which; that C．where; that D．which; where
44．Wolves are highly social animals, ______ success depends upon cooperation.
A．whom B．that C．whose D．her
45．Inspired by dolphins, people have learnt how to send signals underwater, ______ is currently employed in tsunami early-warning systems.
A．which B．that C．who D．what
46．My favorite writer is a key role in literature, most of ______ books put on the stage and screen.
A．who B．whom C．whose D．her
47．We will never forget the days ________ my family visited Shanghai together.
A．when B．which C．what D．that
48．Have you seen the sunflowers________ are bought as presents for your Mother’s Day.
A．who B．which C．whose D．/
49．He made another wonderful invention, ________ of great importance to science.
A．which I think is B．which I think it is
C．which I think it D．I think which is
50．The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.
A．when B．where
C．which D．whose
51．The factory produces half a million pairs of shoes every year, 80%_________are sold abroad.
A．of which B．which of C．of them D．of that
52．The players, ________ came from a big city, were practicing playing basketball on the playground.
A．the tall of whom B．the tallest of whom
C．the tallest one D．the tallest of them
53．He wrote a letter ________he explained what had happened in the accident.
A．which B．that C．how D．where
54．A good advertisement, ________ people attach positive meanings, can contribute to the sales of a product.
A．to which B．of which C．for which D．on which
55．This is one of the tallest buildings ________ been rebuilt since last year.
A．which have B．that has C．which has D．that have
56．—Have you found the information about famous scientists________ you can use for the report?
—Not yet. I’ll search some on the Internet.
A．which B．who C．what D．where
57．—Where did you first meet him?
—It was in a village ________ you can enjoy the nature and fresh air.
A．that B．which C．when D．where
58．Mother bought many tomatoes from the market two days ago, some of ______ have gone bad due to the hot weather.
A．those B．which C．whom D．that
59．Villagers here depend on the fishing industry, ________ there won’t be much work.
A．where B．beyond which C．by which D．without which
60．The reason ________ he was late was that his car broke down on the way.
A．that B．which C．how D．why
61．We are talking about the case ______ he was accused ______ theft.
A．that; in B．where, of C．which; to D．what; on
62．Since many former drug abusers have psychological problems, they often need support groups ________ they can talk about their struggles and find new ways to manage in the world.
A．which B．who C．where D．when
63．I have sent her several letters, ________ she hasn’t replied so far, so I decide to write her again.
A．with which B．in which C．to which D．on which
64．The reason ________ he has been such a success is________he never gives up.
A．why, because B．that, what C．that, that D．why, that
65．He has reached a point of his life________he is supposed to make decisions of his own.
A．which B．where C．how D．why
66．The use of genetic engineering should be restricted to just those cases _____ the health of the mother or her baby is threatened.
A．in which ​​​ B．how C．of whom D．why
67．Marin and his wife both go to work every day by bicycle, ________ contributes to keeping the body healthy.
A．as B．that C．which D．when
68．If a shopping mall has chairs________ women can park their men, women will spend more time in it.
A．which B．that C．where D．when
69．In the new TOFEL test, there are questions ________ test takers ________ read, listen and then speak into a microphone.
A．which … must B．which … need
C．where … must ` D．where … need
70．A sport with a broom on ice ________ requires bowling ________ makes curling one of the most unique sports out there.
A．that … precision B．that … diversity
C．/ … precision D．/ … diversity










参考答案：
1．C
【详解】考查介词+关系代词引导的定语从句。句意：威廉·海斯蒂曾提出，历史告诉我们过去的错误，我们可以从中吸取教训，而不必重蹈覆辙。分析句子可知，空处及之后的句子为定语从句，先行词为mistakes，句子表示“我们可以从错误中吸取教训，而不是重蹈覆辙”，所以空处用“from which”，故选C。
2．B
【详解】考查定语从句。句意：2001年4月29日，威廉王子和凯特·米德尔顿走进婚礼大厅。空处引导定语从句，先行词是April 29, 2001，代替它在从句中作时间状语，应用关系副词when。故选B。
3．C
【详解】考查定语从句。句意：你有没有遇到过这样的情况，有人指责你的记者说错了方向？空处引导限制性定语从句，先行词是case，关系词代替它在从句中作抽象的地点状语，应用关系副词where引导。故选C。
4．A
【详解】考查定语从句。句意：我们已经进入了一个梦想最有可能实现的时代。此处为定语从句修饰先行词an age（一个时代），并在从句中作时间状语，应用when引导。故选A。
5．A
【详解】考查定语从句。句意：当我还小的时候，我的父母给了我一个教育，让我为我们大多数人在以后的生活中面临的生活挑战做好了准备。分析句子结构可知，句中先行词为upbringing ，在定语从句中作主语，所以用关系代词that引导。故选A。
6．D
【详解】考查定语从句。句意：GPNP旨在为生活在大熊猫范围内的所有物种提供更有力的保护，并显著改善该地区生态系统的健康状况。分析句子结构，空处引导限制性定语从句，修饰先行词species，关系词在从句中作主语，先行词指物，且先行词前有all修饰，只能用关系代词that引导从句。故选D。
7．B
【详解】考查定语从句。句意：最近他们在研制一种新药，其效果引起了我们的高度关注。此处为介词+关系代词结构非限制性定语从句修饰先行词 a new kind of drug，结合短语be concerned about可知应用介词about，从句缺少定语。故选B。
8．A
【详解】考查定语从句关系词。句意：一般来说，代沟实际上是一种技术差距，孩子们在最新技术上更新自己，而父母却落后了。该空引导非限制性定语从句，先行词是a technology gap，关系词在从句中作地点状语，用关系副词where。故选A项。
9．A
【详解】考查定语从句。句意：有时背包客会累得有个地方就能睡着。分析句子可知，这里考查There are occasions when...表“有时……”，为固定句型，其中when后面引导定语从句（关系词指代先行词occasions并在从句中作时间状语 ）。故选A项。
10．B
【详解】考查非限定性定语从句。句意：他很自信，在我看来，这是在社会上最重要的。此处为非限定性定语从句，关系词指代前面的内容，在从句中作主语，用关系代词which引导非限制性定语从句，故选B项。
11．C
【详解】考查定语从句。句意：我想推荐的书是《傅雷家书》，在这本书里，傅雷分享了他对艺术和生活的看法。分析句子，设空处引导的是非限制性定语从句，引导词在从句中作地点状语，表示“在书中”。故用where。故选C。
12．C
【详解】考查定语从句。句意：我有许多朋友，其中有一些是商人。根据句意及所给句子可知，逗号后为非限制性定语从句，先行词为friends，介词of+whom (宾格)引导从句，表示“其中”，whom指代人。故选C项。
13．D
【详解】考查非限制性定语从句。句意：我们班一共有五十四名学生，其中最勤奋的是一位来自遥远山村的新学生。句子结构以及句意分析可知，设空处可以填“of whom the most diligent/the most diligent of whom”构成非限制性定语从句，whom在从句中作介词of的宾语，指代先行词“fifty­-four students”；选项A中应把who改成whom，定语从句中关系代词指人，位于介词后用whom，不能用who；B项应去掉并列连词but，或者把whom改为them构成由but连接的并列句；C项应在the前加连词but，构成并列句，或者把them改为whom构成非限制性定语从句。故选D。
14．B
【详解】考查定语从句和表语从句。句意：她没有得到那份工作的原因是她的英语不太好。第一空为定语从句，先行词为The reason，在定语从句中作原因状语，所以用关系副词why引导；第二空为表语从句，从句不缺少成分且句意完整，所以用连接代词that。该句也为The reason why...is/was that...句型，表示“……的原因是……”。故选B。
15．A
【详解】考查定语从句。句意：这就是他在会上解释他工作粗心的原因吗？分析句子可知，本句为定语从句，先行词为the reason，指物，关系词在从句中作宾语，可以用which和that引导该从句，关系词也可以省略。故选A项。
16．C
【详解】考查固定短语和定语从句。句意：我多么后悔没有在学校努力学习，这导致了我的职业生涯的失败！分析句子可知，空格一处涉及固定短语“regret not having done sth.”，意为“后悔没做过某事”，故空格一处应填“not having studied”，句子为非限制性定语从句，先行词为“没有在学校努力学习”这件事，在从句中作主语，故空格二处应用“which”引导从句。故选C项。
17．A
【详解】考查定语从句。句意：这是一个知道事实实际上会比不知道事实更糟的事例吗？分析句子结构可知，此处case为先行词，后引导定语从句，从句中不缺少主、宾、表和定语，故空处需要填关系副词；当case为先行词时，表示抽象地点，需要用where引导定语从句。故选A项。
18．D
【详解】考查定语从句。句意：在某些情况下，这条规则不适用。此处是限定性定语从句，先行词是case，关系词在从句中作地点，应用where引导。故选D项。
19．B
【详解】考查非限制性定语从句。句意：众所周知，她以优美的歌曲而闻名。分析句子可知，空格处为一个非限制性定语从句缺少关系词表示“正如”，应使用as为关系代词，指代主句整个内容符合句意。若用it，则为：It is known to everybody that she is...句型中It是形式主语。故选B项。
20．B
【详解】考查从句。句意：众所周知，当你体验中国灿烂的文化时，书法的美在于内心的平静。分析句意可知，第一空使用连词as引导非限定性定语从句，构成的as we all know意为“周所周知”；第二空使用连词when引导时间状语从句。故选B项。
21．C
【详解】考查介词和定语从句。句意：这本书讨论了过去50年家庭生活的变化程度。extent通常和介词to搭配，to the extent...“到……的程度/地步”，代替先行词extent作介词to的宾语，应用关系代词which引导从句。故选C。
22．D
【详解】考查定语从句。句意：这些梯田是当地壮族和瑶族人建造的，广西是他们的家乡。分析句子结构可知，空处引导的是非限制性定语从句，从句部分结构完整，应该用关系副词引导，结合选项可知使用“介词+关系代词”形式，分析知关系词指代先行词people并在从句中作介词to的宾语，从句中home to为固定搭配意为“是……的故乡”，故填to whom。故选D项。
23．A
【详解】考查定语从句。句意：Shuang Ling中学的每个学生都知道，耐心是成功的源泉。空格处引导的是定语从句，从句中不缺主语或宾语，先行词quality是抽象地点，空格处用关系副词where，故选A。
24．C
【详解】考查定语从句。句意：科学家们每天都在更多地了解植物相互交流的秘密方式。分析句子结构，此句为定语从句，先行词ways在从句作方式状语，用that/in which或者不填。故选C项。
25．C
【详解】考查非限制性定语从句关系词，主谓一致。句意：人们不舒服地坐在塑料椅子上翻阅着旧杂志，这些杂志以前已经被读过几百次了。A. all of them 它们全都； B. each of which它们中每一个； C.all of which 它们全部都； D. each of them它们中每一个。该空需要使用关系代词which代替先行词magazines引导非限制性定语从句；根据空后have可知，主语应为复数意义，应使用all。故选C项。
26．A
【详解】考查定语从句。句意：与世界各地新经济活动领域的情况一样，共享经济的发展速度快于现有法规。分析句子可知，设空处在句中引导一个从句，此处从句修饰整个主句内容，这是一个非限制性定语从句，从句中缺少主语，此处整个从句位于主句前，应用as引导。as和which均可引导非限制性定语从句，修饰整个主句，区别在于as引导的从句可位于主句前，也可位于主句后；而which引导的从句一般位于主句后；且as引导非限制性定语从句时，有“正如”之意，而which没有。故选A项。
27．C
【详解】考查定语从句。句意：要学好英语，你应该把自己置身于被迫用英语交流的环境中。分析可知，此处引导限制性定语从句，先行词为situations，关系副词where引导从句，在从句中作地点状语。故选C项。
28．B
【详解】考查定语从句和表语从句。句意：建桥的地方应该是过江交通最繁忙的地方。分析句子可知，“_____the bridge is supposed to be built ”为定语从句，先行词the place在从句中作地点状语，需用关系副词where或者at which引导，排除A项；“______the cross-river traffic is the heaviest.”为表语从句，从句缺少地点状语，需用连接副词where引导。故选B。
29．B
【详解】考查定语从句。句意：在《2021年世界幸福报告》中列出的国家中，垫底的国家主要是近年来政治冲突等问题普遍存在的欠发达国家。分析句子，设空处引导的是定语从句，此时先行词countries，引导词在从句中作地点状语。故选B。
30．C
【详解】考查定语从句。句意：他开得太快，以致于陷入危险境地，很可能失去对汽车的控制。分析句子结构可知，先行词situation后面是一个定语从句，从句不缺主要成分，先行词在从句中作地点状语，用关系副词where引导，故选C项。
31．D
【详解】考查定语从句和名词性从句。句意：我的手机，没有它我无法联系我的父母，被我的老师拿走了，原因是我在我的英语课上使用它。第一个空考查定语从句，先行词为My cellphone，根据句意“没有它,我不能联系我的父母”，用without which引导非限定性定语从句；第二个空考查同位语从句，解释说明名词the reason，从句不缺少成分且句意完整，所以用that引导。故选D。
32．D
【详解】考查定语从句。句意：工作了10年后，我发现教书是一份工作，在此工作中你在做一些严肃但有趣的事情。分析句子可知，这是一个定语从句，先行词为 a job，在从句中作抽象的地点状语，应用关系副词where引导该从句。故选D项。
33．B
【详解】考查定语从句及强调句。句意：可能是在你昨天和伴侣共进晚餐的餐厅里，你丢失了手包吗？根据句意及句子结构可知，第一空考查定语从句，引导词指代先行词restaurant，并在从句中作地点状语，第一空用where引导；第二空考查强调句，句子结构是it be+被强调部分+who/that，被强调部分是in the restaurant ______ you had dinner with your partner yesterday，引导词应用that。故选B。
34．B
【详解】考查非限制性定语从句。句意：战争是如此残酷，以至于它总是造成巨大的损失，就像在乌克兰和其他国家发生的那样。根据句意及句子结构可知，空处引导非限制性定语从句，缺少的引导词指代先行词“A war is so cruel that it always causes great losses”在从句中作主语，且表示“正如”，应用as引导该从句。故选B。
35．A
【详解】考查定语从句和名词性从句。句意：他没有出现在聚会上的原因是他病了。the reason why ...is/was that...……的原因是……。第一空为定语从句，句中先行词为reason，在定语从句中作原因状语，所以用关系副词why引导；第二空为表语从句，从句不缺少成分且句意完整，所以用连接代词that。故选A。
36．D
【详解】考查宾语从句和定语从句。句意：卡特雷特群岛不断恶化的生活条件最终导致了我们称之为所有岛民的搬迁，从而导致他们失去其传统和庆祝活动的问题。第一空，介词in后接宾语从句，call 后接双宾语，故从句缺少宾语，what引导宾语从句，从句中作宾语，表示“……的东西”；第二空，from____引导非限制性定语从句，指代上文____ we called the relocation of all the islanders，且从句中作介词宾语，故用关系代词which，故选D。
37．C
【详解】考查固定句型和定语从句。句意：要过一段时间他才能再见到他父亲，他父亲的公司刚刚在英国成立。it is some time before...是固定句型，意为“过一段时间才……”，因此第一空是before，引导时间状语从句；分析句子结构可知，第二空引导的是非限制性定语从句，“his father”和business之间是所属关系，因此第二空用关系代词whose，故选C。
38．C
【详解】考查定语从句的关系词。句意：这是奥斯卡历史上最令人惊讶的时刻之一，演员威尔·史密斯走上舞台，因为洛克开了一个关于史密斯妻子头发的玩笑而掌掴克里斯·洛克。分析句子可知，句中含有两个限制性定语从句。第一个定语从句的先行词是one of the most surprising moments，关系词在定语从句中作时间状语，故用关系副词when引导；第二个定语从句的先行词是joke，关系词在定语从句中作宾语，故用关系代词that/which。故选C项。
39．C
【详解】考查主语从句和定语从句。句意：出乎意料的是，他们终于来到了一个卖饮料和其他小商品的地方。______was beyond their expectation是缺乏连接词的主语从句，从句缺乏主语，意为“什么”，故用连接代词What；a place______sold drinks and other small articles是缺乏关系词的定语从句，先行词是a place，指物，在从句中作主语，用关系代词which。故选C项。
40．C
【详解】考查非谓语动词和定语从句。句意：警方发现，这两本“被盗”的笔记本被放在一个里面装着存放这两本笔记本的原来的蓝色盒子和一个棕色信封的礼品袋里。此题第一空考查非谓语动词，contain与逻辑主语a gift bag为主谓关系，应用现在分词containing，作后置定语。第二空考查定语从句，先行词为the original blue box，在限制性定语从句中作介词in的宾语，为物，设空处可用关系代词that/which，也可省略。故选C项。
41．B
【详解】考查名词性从句和定语从句。句意：如今，教师们一直在不遗余力地创造他们希望的最好的手段来提高在线教学的效率，尽管有些学生没有注意到或在意这些。分析句子结构可知，第一空设空处位于动词create后，引导了一个从句，这是一个宾语从句，在从句中充当谓语will be的主语，故第一空应填what；而后面的they hope实际上是一个省略了that的定语从句，可以遮住不看；第二个空位于逗号后，是一个非限制性定语从句，先行词为整个主句，故应填which。故选B项。
42．C
【详解】考查名词性从句和定语从句。句意：文章最后指出，我们买的东西经常影响世界各地许多人的生活。第一空It is suggested that…为主语从句，it为为形式主语，真正的主语为that从句。第二空为定语从句，句中先行词为the things，在定语从句中作动词buy的宾语，所以用关系代词which或that引导，也可以省略关系代词。故选C。
43．B
【详解】考查定语从句和强调句。句意：事故是在我们过去住的那个村庄发生的吗？根据句子结构，第一空为which引导的限制性定语从句，修饰先行词the village，先行词在定语从句中作live in的宾语，应用关系代词which引导；分析句子，全句使用了强调句型“It + is/was + 被强调部分 + that + 句子其它部分”的一般疑问句形式，本句强调的是原句中地点状语“in the village where we used to live in”，句子其它部分由that引出。故选B。
44．C
【详解】考查定语从句。句意：狼是高度群居的动物，它们的成功依赖于合作。分析可知，空格处引导的是非限制性定语从句，先行词Wolves和success之间是所属关系，因此空格处用表示所属的关系代词whose引导定语从句，故选C。
45．A
【详解】考查which引导的非限制性定语从句。句意：受海豚的启发，人们已经学会了如何在水下发送信号，这目前被用于海啸预警系统。分析句子结构及句意可知，空处应填非限制性定语引导词，先行词是空前主句的内容，且从句缺少主语，应用关系代词which引导从句。故选A。
46．C
【详解】考查定语从句。句意：我最喜欢的作家是文学界的关键人物，他的大部分作品都被搬到了舞台和银幕。分析句子结构，逗号后是“most of+关系词”引导的非限制性定语从句，修饰先行词writer，且结合语意，此处表示作家的大部分作品，空处应用关系词whose，在从句中作定语。故选C项。
47．A
【详解】考查定语从句。句意：我们永远不会忘记我的家人一起访问上海的日子。此处是限定性定语从句，先行词是the days，在从句中作时间状语，应用关系副词when引导。故填A。
48．B
【详解】考查定语从句的关系代词。句意：你看到了作为你的母亲节礼物买来的向日葵吗？此题考查限制性定语从句，the sunflowers为先行词，先行词在从句中作主语，为物，设空处可用关系代词which或者that，且不能省略。故选B项。
49．A
【详解】定语从句中加入插入语。句意：他又做出了一项了不起的发明，我认为这对科学非常重要。因插入语应位于引导词之后，所以D项不对，B、C两项无法构成正确结构。故选A。
50．B
【详解】考查定语从句。句意：治疗将继续进行，直到患者能够正确和安全地行走。分析句子结构可知，空格后为定语从句，修饰名词point；表示“阶段、程度、地步”，在定语从句中作地点状语，所以用where引导定语从句。故选B。
51．A
【详解】考查定语从句。句意：这个工厂每年生产五十万双鞋，其中80%的鞋都出口。由语境逻辑结合标点符号可知，定语从句不是先行词 half a million pairs of shoes (指物) 不可缺少的内容，而只是与其存在局部与整体的关系，因此应用数词(80%) + of which 结构引导非限制性定语从句。故选A项。
52．B
【详解】考查定语从句。句意：运动员们在操场上练习打篮球，他们当中长得最高的来自大城市。分析句子结构可知，该句是非限制性定语从句，先行词是players，是人，根据语意以及定冠词the后面接形容词最高级可知，此处为the tallest，表示“长得最高的人”，先行词从句中作介词of的宾语，用关系代词whom。故选B项。
53．D
【详解】考查定语从句。句意：他写了一封信，在信里解释了事故中发生了什么。分析句子可知，句子为限制性定语从句，先行词为“letter”，在从句中作地点状语，即“he explained what had happened in the accident in the letter”，故应用关系副词“where”引导从句。故选D项。
54．A
【详解】考查定语从句。句意：一个好的广告，人们赋予它积极的意义，可以有助于产品的销售。分析句子可知，此处是“介词+关系词”引导的非限制性定语从句，先行词是advertisement，attach sth to sth把……附在……上，固定短语，故此处介词用to，关系词在从句中作介词to的宾语，应用关系代词which，故选A项。
55．D
【详解】考查定语从句和主谓一致。句意：这是去年以来重建的最高的建筑物之一。分析句子结构可知，空格处引导的是定语从句，从句中缺少主语，先行词buildings是物，且被最高级tallest修饰，因此用关系代词that引导定语从句，排除A和C；定语从句中谓语动词形式和先行词保持一致，先行词buildings是复数，因此that后是have，故选D。
56．A
【详解】考查定语从句。句意：——你找到为你报告所用的关于有名科学家的信息了吗? ——还没有。我会网上再搜索一些的。该空引导限制性定语从句，先行词是information，指物，在定语从句中做use 的宾语，用关系代词which/that。故选择A。
57．D
【详解】考查定语从句。句意：——你在哪里初次见到他？——在一个可以享受大自然和呼吸新鲜空气的村庄里。此处为限制性定语从句，关系词指代先行词a village并在从句中作地点状语，用关系副词where。故选D。
58．B
【详解】考查定语从句。句意：母亲两天前从市场上买了许多西红柿，由于天气炎热，有些已经坏了。句中先行词为tomatoes，指物，在非限定性定语从句中作some of的宾语，所以用关系代词which引导。故选B。
59．D
【详解】考查介词+关系代词引导的非限制性定语从句。句意：这里的村民以渔业为生，没有了渔业就不会有太多的工作。分析句子结构可知，空处所在句子应为非限制性定语从句，对主句内容进行补充，关系代词which指代先行词fishing industry，结合句意，村民离开了渔业就无以为生，所以用介词without。故选D项。
60．D
【详解】考查定语从句。句意：他迟到的原因是他的小车在来的路上抛锚了。分析可知，空处引导定语从句，先行词reason在从句中作原因状语，应用关系副词why引导。故选D。
61．B
【详解】考查定语从句和固定搭配。句意：我们正在谈论他被指控偷窃的案件。先行词是the case，在从句中作地点状语，用关系副词where引导限制性定语从句，固定搭配be accused of (被指控)。故选B项。
62．C
【详解】考查定语从句。句意：由于许多前吸毒者有心理问题，他们经常需要支持小组，在那里他们可以谈论自己的斗争，并在世界上找到支撑的新方法。此处是限制性定语从句，先行词是support groups，在从句中做地点状语，用关系副词where。故选C项。
63．C
【详解】考查介词+which的用法。句意：我给她写了好几封信，她到现在还没有回信，所以我决定再给她写封信。分析句子可知，此处为介词+which引导的非限制性定语从句，其中replied to letters“回信”为固定短语，故将此处的介词to前置放在which前，先行词letters在从句作replied to的宾语成分。故选C项。
64．D
【详解】考查定语从句和表语从句。句意：他如此成功的原因是他从不放弃。分析句子结构可知，“he has been such a success”是定语从句，从句中不缺主语或宾语，先行词reason是原因，因此第一空用关系副词why，“he never gives up”是表语从句，从句中不缺主语或宾语，且句子意思完整，因此第二空用that引导表语从句，故选D。
65．B
【详解】考查定语从句。句意：他已经到了应该自己做决定的人生阶段。分析句子结构可知，空格处引导限定性定语从句，先行词“point of his life”是抽象地点，在从句中作地点状语，应用关系副词where引导。故选B。
66．A
【详解】考查定语从句。句意：母亲或婴儿健康受到威胁的情况下，基因工程的使用应该被限制。分析句子结构可知，此处是考查定语从句，先行词是cases，在这些情况下是in those cases。故介词为in，关系代词为which。故选A项。
67．C
【详解】考查定语从句。句意：马林和他的妻子每天都骑自行车上班，这有助于保持身体健康。此处为非限制性定语从句修饰上文整个句子，从句中缺少主语，故用which引导。that不能引导非限制性定语从句。故选C。
68．C
【详解】考查定语从句。句意：如果商店有椅子，可供女人们安顿他们的丈夫，女人们在商店就会花更多时间。分析句子可知，空格处引导定语从句，从句中不缺主语或宾语，先行词为chairs，是地点，因此空格处用关系副词where，故选C。
69．C
【详解】考查定语从句和情态动词。句意：在新的托福考试中，有一些问题，考生必须阅读、倾听，然后对着麦克风说话。根据句型分析可知，第一空考查定语从句，先行词为questions，在从句中作状语，所以应选where；第二空考查情态动词，need作为情态动词一般只用于否定和疑问句中，肯定句中，need为实义动词，所以第二空应选must。故选C项。
70．A
【详解】考查定语从句和名词词义辨析。句意：冰壶是一项要求精准度的运动，它在冰上要使用冰刷，这使得冰壶成为最独特的运动之一。precision 精准度；diversity 多样性。第一个空处考查限定性定语从句，先行词是sport，在从句中作主语，应用关系代词that或which，且不能省略；第二个空处考查名词词义辨析，根据常识可知，冰壶要求精准度，应用名词precision。故选A项。