所属成套资源:2024-2025学年八年级英语上册单元重难点易错题精练(牛津译林版)
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Unit 5 Wild animals 语法Grammar 情态动词may和动词不定式作宾语(含答案) 2024-2025学年八年级英语上册单元重难点易错题精练(牛津译林版)
展开这是一份Unit 5 Wild animals 语法Grammar 情态动词may和动词不定式作宾语(含答案) 2024-2025学年八年级英语上册单元重难点易错题精练(牛津译林版),文件包含Unit5Wildanimals语法Grammar情态动词may和动词不定式作宾语教师版2024-2025学年八年级英语上册单元重难点易错题精练牛津译林版docx、Unit5Wildanimals语法Grammar情态动词may和动词不定式作宾语学生版2024-2025学年八年级英语上册单元重难点易错题精练牛津译林版docx等2份试卷配套教学资源,其中试卷共26页, 欢迎下载使用。
班级 姓名 学号 分数 Unit 5 Wild animals情态动词may和动词不定式作宾语(时间:60分钟,满分:100分)情态动词may当我们猜测某件事发生的可能性时,常用may来表示“也许”、“可能”。如: You may be right.你可能是对的。He is away on business. He may not come to the party this evening.他出差了,可能不会来参加今天晚上的聚会。注意:may 表示“可能”时,通常只用于肯定句和否定句中,相当于possibly、perhaps或maybe。动词不定式作宾语当句子中已经有谓语动词,而我们又要表达不止一个动作概念时,其余的动词可以使用非谓语形式表达。动词不定式就是动词的一种非谓语形式,其基本形式是“to+动词原形”。如:He wants to play football after class.他想课后踢足球。My mother forgot to turn off the lights yesterday.我妈妈昨天忘记关灯了。注意:动词不定式在句子中不作谓语,因此没有人称、数和时态的变化。动词不定式在句中常作谓语动词的宾语,这一类谓语动词常见的有:agree(同意) choose(选择) decide (决定) forget(忘记) hope(希望) learn(学习) like(喜欢) plan(计划) prepare (准备) promise(答应) refuse(拒绝) remember (记得) seem(觉得好像)want(想要) wish(希望) would like(想要) I decided to visit my grandparents this weekend. 我决定这个周末去看望祖父母。注意:动词不定式的否定形式是“not to+动词原形”。如:You must promise not to be late again.你必须保证不再迟到了。单项选择(本大题共50小题,每小题2分,共100分)1.(23-24八年级上·江苏扬州·期末)—Will David join us in the task?— He ________ come, but... You know, he changes his mind so often.A.should B.must C.need D.may2.(23-24八年级上·江苏南京·期末)—You have so many boxes here. What’s in the red one? —It ________ be a pair of binoculars. I’m not sure.A.may B.will C.must D.should3.(23-24八年级上·江苏扬州·期末)—Shall I take an umbrella this afternoon?—Yes. You’d better. It ________ rain.A.shall B.may C.should D.need4.(23-24八年级上·江苏扬州·期末)—Sandy, how will Tom come to the party? —He________ drive his car, but I’m not sure.A.must B.can C.may D.should5.(23-24八年级上·江苏宿迁·期末)—Did you decide where to go for the coming weekend? —I’m not sure. I ________ go to the City Park.A.should B.may C.must D.would6.(22-23八年级下·江苏连云港·期末)—Which place are you going to visit this summer holiday? —I ________ visit Hangzhou, but I’m not sure.A.may B.must C.should D.could7.(23-24八年级上·江苏镇江·期末)—Where is your elder brother, Sandy?—He ________ be in the library, but I’m unsure. You can call him.A.may B.must C.needn’t D.shouldn’t8.(23-24八年级下·江苏常州·期中)—Do you know the largest iceberg (冰山) began to move at the end of 2023? —Yes. Its movement ________ cause trouble for animals nearby, but the scientists are not sure.A.may B.have to C.must D.should9.(23-24八年级下·江苏南京·期中)—________ I wash the clothes at once?—No. You ________. You ________ clean the room first.A.May; needn’t; must B.Must; mustn’t; mayC.Must; don’t have to; may D.Must; don’t need to; have to10.(22-23八年级下·江苏宿迁·开学考试)— Look! The girl ________ long hair is building a snow house. Is she Sandy?— It ________ be her. I’m not sure.A.with; mustn’t B.has; must C.has; can’t D.with; may11.(22-23八年级上·江苏镇江·期末)—Is your sister coming to Zhenjiang during the Spring Festival?—I’m not sure. She ________ not come.A.must B.can C.may D.should12.(22-23八年级上·江苏扬州·期末)—Mum, I received a box from my uncle. What’s in it?—I’m not sure. It ________ be some tools. He knows you like DIY a lot.A.needn’t B.shouldn’t C.must D.may13.(22-23九年级上·安徽六安·期末)Don’t drive so fast. Or you ________ cause the accident.A.must B.may C.should D.need14.(22-23八年级上·江苏宿迁·期末)—What will the weather be like this afternoon, Anna?—It _______ be fine. But who knows? It’s always changing quickly.A.must B.will C.need D.may15.(22-23八年级上·江苏淮安·期末)—Did you decide where to go for the coming weekend?—I’m not sure. I ________ go to City Park.A.should B.may C.need D.would16.(22-23八年级上·江苏无锡·期末)—Where will you go during the Spring Festival?—I have no idea. We ________ go to Nanchan Temple. It’s a good place to have fun.A.may B.must C.should D.need17.(22-23八年级上·江苏无锡·期末)Take an umbrella with you, Simon. It ________ rain any time in London.A.must B.may C.mustn’t D.can’t18.(22-23八年级上·江苏·期末)—How about going to Suzhou Museum tomorrow?—I’d like to, but I ________ not be free.A.would B.may C.must D.need19.(22-23八年级上·江苏镇江·期末)—Look at the great building! What is it for?—It ________ be a hotel. I saw people walk in with their suitcases, but I’m not very sure.A.must B.can C.may D.should20.(22-23八年级上·江苏常州·期末)—What’s your plan for the coming winter holiday? —I ________ go to Hainan. But it’s still hard to decide because of COVID-19.A.must B.need C.may D.should21.(22-23八年级上·江苏盐城·期末)—Where will you show the exchange students around this weekend?—I’m not sure now. We visit Dafeng Milu National Nature Reserve.A.may B.must C.should D.need22.(22-23八年级上·江苏盐城·期末)—What’s your plan for the winter holiday?—I ________ go back to my hometown with my parents, but we haven’t decided yet.A.must B.may C.need D.should23.(22-23八年级上·江苏南京·期末)—Will your father be back home at 6 o’clock this evening?—He should, but he ________ not. Sometimes he goes to the gym after work.A.can B.must C.need D.may24.(22-23八年级上·江苏南通·期中)—How nice the building is! What is it for?—It ________ a hotel. But I’m not so sure.A.must be B.should be C.may be D.can be25.(22-23八年级上·江苏宿迁·期末)—Who is singing in the next room? It sounds like a young girl’s voice. —I am not sure. It ________ be Jane.A.should B.must C.may D.will26.(23-24八年级上·江苏扬州·期末)When he failed ________ at a traffic light, he knew he broke the road rules.A.stopping B.to stopping C.stop D.to stop27.(23-24八年级上·江苏无锡·期末)I decided ________ the painting because the more I looked at it, the less I liked it.A.to buy B.buying C.not to buy D.not buying28.(23-24八年级上·江苏扬州·期末)The teacher told all of us ________ some notes while watching the birds.A.not to forget to take B.not forget to takeC.don’t forget to take D.not to forget taking29.(22-23八年级上·江苏南通·期末)—Don’t forget ________ the bus at the fifth station along the line. You can find the Sports Centre on your right.—OK, I won’t. Thank you.A.getting on B.getting off C.to get on D.to get off30.(22-23八年级上·江苏无锡·期末)—Remember __________ a mask before you go out, Jack.—OK, I will.A.wear B.wore C.wearing D.to wear31.(22-23八年级下·江苏南京·期末)—Could you manage, if you don’t mind, ________ the work on time?—No problem.A.finishing B.to finish C.finished D.finish32.(22-23八年级下·天津河西·期末)He never refuses ________ his classmates.A.help B.helping C.helped D.to help33.(23-24八年级下·江苏扬州·期中)In the Name of People is ________ that lots of people can’t wait ________ the book.A.quite a great work; reading B.such great work; to readC.so great a work; reading D.such a great work; to read34.(23-24八年级下·江苏南通·期中)The students were so happy because the teacher agreed ________ them to the museum.A.take B.to take C.taking D.took35.(23-24八年级下·江苏扬州·期中)We found ________ not easy ________ fifty English words in one day.A.it is, to remember B.it, to remember C.that, remember D.that was, to remember36.(22-23八年级上·江苏无锡·期中)Here comes the bus. Many people can’t wait at once.A.get on it B.to get it on C.getting it on D.to get on it37.(22-23八年级上·江苏宿迁·期中)—Just stop ________ a rest, Mike. You keep reading for two hours.—But the book is really interesting.A.have B.to have C.to having D.having38.(22-23八年级上·江苏镇江·期中)— Did you enjoy your trip to London?— Very much. I couldn’t wait ________ photos after arriving there.A.to take B.to taking C.for taking D.take39.(22-23八年级上·江苏盐城·期中)You look so tired. You’d better ________ some music to relax.A.to stop to listen to B.to stop listening toC.stop to listen to D.stop listening40.(22-23八年级下·江苏镇江·期末)—Do you mind me parking here? —I think it proper ________ your car in others’ way.A.don’t park B.not park C.not parking D.not to park41.(21-22八年级上·江苏宿迁·期中)Our teachers advise our middle school students ________ at least one hour ________ exercise every day to keep healthy.A.to spend; taking B.spending; to take C.spending; taking D.to spend; to take42.(21-22八年级上·江苏宿迁·期中)It took Amy about two hours ________ to the World Park. She couldn’t wait ________ the bus.A.get; get off B.to get; get off C.get; to get off D.to get; to get off43.(21-22八年级上·江苏盐城·期中)When the bus stopped, he couldn’t wait ________.A.getting off it B.to get off it C.to get it off D.got off it44.(21-22八年级上·江苏泰州·期中)Time seems ________ when we are playing computer games.A.to go faster B.going faster C.to going faster D.goes fastest45.(21-22八年级下·江苏宿迁·期末)I could afford ________ for a new bike myself through my part-time job.A.pay B.to pay C.paying D.paid46.(21-22八年级下·江苏镇江·期中)The “double reduction” policy (双减政策) is really wonderful for students. And now some parents refuse ________ their children to the weekend training centre for extra classes.A.send B.sends C.sending D.to send47.(21-22八年级下·江苏淮安·期中)I used to ________ snacks alone, but now I am used to ________ them with my friends.A.eat; sharing B.eat; share C.eating; share D.eating; sharing48.(21-22八年级下·江苏常州·期中)—Your cousin Mike refuses ________ pork for dinner, doesn’t he?—Yes, he does. But I don’t mind ________ any food.A.to have; eating B.having; to eat C.to have; to eat D.having; eating49.(21-22八年级下·江苏泰州·期中)—Why not stop ________ a rest? —Oh. I can’t stop ________ the kite on such warm spring days.A.having; flying B.to have; to fly C.having; to fly D.to have; flying50.(22-23八年级上·江苏扬州·阶段练习)I found ________ not easy to do birdwatching alone in the beginning.A.that B.it C.its D.it’s参考答案:1.D【详解】句意:——David会在任务中加入我们吗?——他可能会来,但是,你知道,他经常会改变主意。考查情态动词辨析。should应该;must必须;need需要;may可能。根据“You know, he changes his mind so often.”可知,David经常改变主意,此处是否加入应是可能性的一种推测,所以应填may。故选D。2.A【详解】句意:——你这儿有这么多盒子。那个红色的盒子里是什么?——可能是一副望远镜。我不确定。考查情态动词辨析。may可能;will将会;must必须;should应该。根据“I’m not sure.”可知,说话人不确定盒子里是什么,此处要用may表示肯定推测。故选A。3.B【详解】句意:——今天下午我要带把伞吗? ——是的。你最好带上。可能会下雨。考查情态动词。shall将要;may可能;should应该;need需要。根据“Yes. You’d better.”可知,此处是可能会下雨,所以最好带上雨伞,用may表示没有把握的推测。故选B。4.C【详解】句意:——Sandy,Tom怎么来参加聚会? ——他可能开车来,但我不确定。考查情态动词。must必须,一定;can能;may可能;should应该。根据“but I’m not sure”可知,不确定Tom会怎样来参加聚会,是一种不确定的推测,因此 “可能开车” 符合语境。故选C。5.B【详解】句意:——你决定周末去哪里了吗?——我不确定。我可能会去城市公园。考查情态动词。should应该;may可能;must必须;would愿意。根据“I’m not sure”可知,说话者不是很确定,此处表示可能性。故选B。6.A【详解】句意:——这个暑假你打算去哪个地方?——我可能会去杭州,但我不确定。 考查情态动词。may可能;must一定;should应该;could能。根据“I’m not sure”可知可能去杭州,但是不确定。故选A。7.A【详解】句意:——桑迪,你哥哥在哪里? ——他可能在图书馆,但我不确定。你可以打电话给他。考查情态动词。may可能;must必须;needn’t不需要;shouldn’t不应该。根据“but I’m unsure.”可知,此处是不确定,所以前面表示是“可能”在图书馆,故选A。8.A【详解】句意:——你知道最大的冰山在2023年底开始移动吗?——知道。它的移动可能会给附近的动物带来麻烦,但科学家们并不确定。考查情态动词。may可能;have to不得不,必须;must必须;should应该。根据“but the scientists are not sure”可知,科学家不确定,所以是“可能”。故选A。9.C【详解】句意:——现在我必须洗衣服吗,妈妈? ——不,你不必。你可以先打扫房间。考查情态动词。以Must开头的一般疑问句,其否定回答用:No, 主语+needn’t/don’t/doesn’t have to,第三空表示“可以”先打扫房间。故选C。10.D【详解】句意:——看!那个长头发的女孩正在堆雪房子。她是珊迪吗?——可能是她。我不太确定。考查介词和情态动词用法。问句中“is building”是谓语,所以“The girl”后不能再加动词,用介词“with”来表示“有着”。答句中“I’m not sure.”表示不确定,所以用情态动词“may”表可能的推测。故选D。11.C【详解】句意:——你姐姐春节要来镇江吗?——我不确定。她可能不会来。考查情态动词辨析。must必须;can会;may可能;should应该。根据“I’m not sure.”可知,此处表示推测,因此此处表达的是“可能会来”,用情态动词may。故选C。12.D【详解】句意:—— 妈妈,我收到了一个来自叔叔的盒子。里面有什么?—— 我不确定。可能是一些工具。他知道你很喜欢DIY。考查情态动词。needn’t 不需要;shouldn’t 不应该;must必须;may也许;由句中“I’m not sure.”可以推出,后面的情形只能是推测。故选D。13.B【详解】句意:别开那么快。否则你可能会引起事故。考查情态动词。must一定;may可能;should应该;need需要。根据语境可知,开的太快可能会导致事故,故选B。14.D【详解】句意:——安娜,今天下午天气怎么样?——也许很好。但谁知道呢?它总是变化得很快。考查情态动词。must必须;will将会;need需要;may可能,也许。根据“But who knows? It’s always changing quickly.”可知,此处表示“可能”天气很好,表示不确定的推测,用may。故选D。15.B【详解】句意:——你决定下周末去哪里了吗?——我不确定。我可能去城市公园。考查情态动词用法。should应该;may可能;need需要;would愿意,将。根据答句“I’m not sure. ”可知,空处是表猜测,需用情态动词may。故选B。16.A【详解】句意:——春节期间,你会去哪里?——我还不知道。我们可能会去南禅寺。那是个很好玩的地方。考查情态动词辨析。may可能;must必须;should应该;need需要。根据“I have no idea”可知,去哪里还不确定,说明可能会去南禅寺,用情态动词may表示可能。故选A。17.B【详解】句意:带把伞吧,西蒙。伦敦随时都可能下雨。考查情态动词辨析。must必须;may可能;mustn’t禁止;can’t不能。根据“Take an umbrella with you, Simon.”可知,伦敦随时“可能”下雨,所以建议要带上雨伞。表示不确定的肯定推测用may。故选B。18.B【详解】句意:——明天去苏州博物馆怎么样?——我很想去,但我可能没有空。考查情态动词。would将要;may可能;must必须;need需要。根据“I’d like to, but I...not be free.”可知,此处表示“可能”没有空,应用may表示,故选B。19.C【详解】句意:——看看那座伟大的建筑!它是做什么用的?——可能是一家旅馆。我看到有人带着行李箱走进来,但我不太确定。考查情态动词辨析。must必须;can可以;may可能;should应该。根据“I saw people walk in with their suitcases, but I’m not very sure.”可知,此处表示推测,用may表示“可能”。故选C。20.C【详解】句意:——你对即将到来的寒假有什么计划?——我可能去海南。但由于新冠病毒,仍然很难决定。考查情态动词。must必须;need需要;may可能;should应该。根据“But it’s still hard to decide”可知,表示不确定的肯定推测用may。故选C。21.A【详解】句意:——你这个周末会带交换生去哪里参观?——现在我还不确定。我们可能会去参观大丰麋鹿国家级自然保护区。考查情态动词。may可能;must必须,一定;should应该,应当;need需要。根据“I’m not sure now.”可知,说话者现在还不确定是否会去参观大丰麋鹿国家级自然保护区,因此用may表示不确定性,即有可能去。故选A。22.B【详解】句意:——你的寒假计划是什么?——我要和父母一起回家乡,但我们还没有决定。考查情态动词。must必须;may可能;need需要;should应该。根据“but we haven’t decided yet.”可知还没决定好,说明这个计划不确定,应用may,故选B。23.D【详解】句意:——爸爸今晚6点会回家吗?——他应该,但可能不会。有时他下班后去体育馆。考查情态动词。can可以;must必须;need需要;may可能。根据“but”表转折及“Sometimes he goes to the gym after work.”可知,他可能不会在6点回家,空处表示可能性推测,用may表示。故选D。24.C【详解】句意:——这建筑真漂亮!这是干什么用的?——可能是酒店。但我不确定。考查情态动词辨析。must be必须;should be应该;may be可能;can be可以。根据“But I’m not so sure.”可知,此处表示推测,用may be。故选C。25.C【详解】句意:——谁在隔壁房间唱歌?听起来像是一个年轻女孩的声音。——我不确定。可能是简。考查情态动词。should应该;must一定;may可能;will将。根据“I am not sure.”可知表示不确定的推测应用may。故选C。26.D【详解】句意:当他没有在红绿灯前停车时,他就知道自己违反了道路规则。考查动词不定式。fail to do sth“未能做某事”,固定用法,空处应填动词不定式。故选D。27.C【详解】句意:我决定不买这幅画,因为我越看,越不喜欢它。考查非谓语动词。buy买;to buy动词不定式;buying是动名词;not to buy是动词不定式的否定形式;not buying是动名词的否定形式。根据观察可知题干使用了decide (not) to do sth句型,意思是“决定(不)做某事”,因此可先排除B和D。根据“the more I looked at it, the less I liked it”可知越看越不喜欢,所以决定不买。故选C。28.A【详解】句意:老师告诉我们当观察鸟的时候,不要忘记记笔记。考查动词不定式。tell sb. (not) to do sth.意为“告诉某人(不)做某事”。forget to do sth.意为“忘记去做某事”。故选A。29.D【详解】句意:——别忘了在沿线的第五站下车。你可以在你的右边找到体育中心。——好吧,我不会。非常感谢。考查非谓语动词以及动词短语。get on上车;get off下车。forget to do sth.“忘记要做某事”,动作还未发生;forget doing sth.“忘记做过的事情”。根据“Don’t forget...”可知此处动作还未发生,用forget to do;根据“You can find the Sports Centre on your right.”可知要在第五站下车。故选D。30.D【详解】句意:——Jack,你出去时,记得戴口罩。——好的,我会戴的。考查动词短语。wear穿戴,动词原形;wore过去式形式;wearing现在分词形式;to wear动词不定式形式。remember to do sth.记得去做某事,此事未做;remember doing sth.记得做过某事,此事已做。根据“OK, I will.”可知应该是出门戴口罩,还未做。故选D。31.B【详解】句意:——如果你不介意,你能设法按时完成这个工作吗?——没问题。考查动词不定式作宾语。根据“manage”可知,manage to do sth表示“设法做某事”,空处需填“to+动词原形”,finish“完成”,动词。故选B。32.D【详解】句意:他从不拒绝帮助他的同学。考查非谓语动词。根据“refuses”可知,refuse to do sth.“拒绝做某事”,故此处应用动词不定式作宾语。故选D。33.D【详解】句意:《人民的名义》是一部如此好的作品,以至于很多人都迫不及待地想读原著。考查such...that...引导的结果状语从句和动词短语。根据“In the Name of People is...that lots of people can’t wait...the book”可知,句子应为结果状语从句,即“so+形容词+a(n)+名词单数”或“such+a(n)+形容词+名词单数/such+形容词+不可数名词或名词复数”,排除A;因《人民的名义》是一部如此好的作品,work应为单数,排除B;固定搭配can’t wait to do sth表示“迫不及待地想做某事”,二空处需填“不定式to+动词原形read”。故选D。34.B【详解】句意:学生们非常兴奋因为老师同意带他们去博物馆。考查非谓语动词。agree to do sth.表示 “同意做某事”,不定式作宾语,故选B。35.B【详解】句意:我们发现在一天记下五十个英语单词是不容易的。考查it作形式宾语和动词不定式作宾语。find it+形容词+to do sth“发现做某事……”是一个常用结构,it作形式宾语,动词不定式作真正的宾语。故选B。36.D【详解】句意:公共汽车来了。很多人都迫不及待地想马上上车。考查动词短语。根据“Many people can’t wait…at once.”可知,此处指的是人们迫不及待地想上车。can’t wait to do sth.迫不及待做某事,空处应用动词的不定式;get on为“动词+介词”短语,意为“上车”,代词it应放在介词on后面。故选D。37.B【详解】句意:——停下来休息一下,迈克。你连续阅读两个小时了。——但是这本书真的很有趣。考查非谓语动词。stop doing sth“停止正在做的事”;stop to do sth“停下来去做另一件事”。根据“You keep reading for two hours.”可知是建议对方停止读书去休息一下,用动词不定式作宾语。故选B。38.A【详解】句意:——你的伦敦之行愉快吗?——非常愉快。到达那里后,我迫不及待地想拍照。考查非谓语。can’t wait to do sth“迫不及待做某事”,应用动词不定式。故选A。39.C【详解】句意:你看起来很累。你最好停下来听听音乐放松一下。考查had better的用法和非谓语动词。由had better do sth.“最好做某事”,可排除A、B选项;stop to do sth.“停下来做另一件事”,stop doing sth.“停止做某事”;由“You look so tired.”和“some music to relax”可知,此处是停下来听音乐放松自己,应用stop to do。故选C。40.D【详解】句意:——你介意我把车停在这里吗?——我认为不把车停在挡住别人的路上是恰当的。考查非谓语动词。本句是 “ think it +形容词+to do sth”意为“觉得做某事是……”句式;可知此处填不定式的否定式。故选D。41.A【详解】句意:我们的老师建议中学生每天至少花一个小时锻炼以保持健康。考查非谓语动词。spend花费,主语是人;take花费,取,拿。advise sb. to do sth.“建议某人做某事”;spend some time (in) doing sth.“花时间做某事”。所以空一填动词不定式to spend,空二填taking。故选A。42.D【详解】句意:艾米花了大约两个小时才到达世界公园。她迫不及待地想下车。考查非谓语动词。第一空是固定句型:It takes sb some time to do sth“某人花费时间做某事”;第二空是固定短语can’t wait to do sth“迫不及待做某事”。故选D。43.B【详解】句意:当公交车停下时,他迫不及待地下车了。考查非谓语动词和动词短语。get off下车;get…off把……拿掉。根据“When the bus stopped”可知,这里表示“下车”,故排除C项;can’t wait to do sth.“迫不及待做某事”,固定搭配。故选B。44.A【详解】句意:当我们玩电脑游戏的时候,时间似乎过得更快。考查非谓语动词。seem to do sth.“似乎要做某事”,固定短语;同时语境中暗含了比较含义,故选A。45.B【详解】句意:通过我的兼职工作,我自己能承担得起买一辆新自行车的费用。考查非谓语动词。afford to do sth.“负担得起做某事”,动词不定式作宾语。故选B。46.D【详解】句意:“双减”政策对学生来说真的太好了。现在一些家长拒绝送他们的孩子去周末培训中心上额外的课程。考查非谓语动词和动词短语。send“送”,refuse to do sth“拒绝做某事”,故选D。47.A【详解】句意:我以前独自吃零食,但现在我习惯了和朋友们分享。考查非谓语动词。根据题干可知,短语used to do sth表示“过去常常做某事”,其后接动词原型;短语be used to doing sth表示“习惯做某事”,其后接动名词形式。故选A。48.A【详解】句意:——你的表弟Mike晚餐拒绝吃猪肉,是吗?——是的,他不吃。但是我不介意吃任何食物。考查非谓语动词。refuse to do sth表示“拒绝做某事”;mind doing sth表示“介意做某事”。故选A。49.D【详解】句意:——为什么不停下来休息一下呢?——哦,在如此暖和的春天我无法停止放风筝。考查非谓语动词。stop doing sth.停止做某事;stop to do sth.停下来去做另一件事;根据“a rest”可知,是停下来去休息,第一空用to have;根据“on such warm spring days”可知,是不能停止放风筝,第二空用flying.。故选D。50.B【详解】句意:我发现开始时独自观鸟是不容易的。考查it作形式宾语的用法。find it+adj.+to do sth.“发现做某事是怎样的”,其中“it”为形式宾语,真正的宾语为动词不定式,故选B。