初中考英语：语法时态综合强化练习100题及答案

这是一份初中考英语：语法时态综合强化练习100题及答案，共19页。
初中考英语：语法时态综合强化练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．—Let's go climbing if it ___ tomorrow.
—But nobody knows if it ___tomorrow.
A．won't rain; rains B．doesn't rain; rains
C．doesn't rain; will rain D．won't rain; will rain
2．It that Yu Mei has changed a lot.
A．seems B．looks like C．seems like D．seemed
3．I want to know if they ____ the spring sports meeting next month.
If they ____ it, I must get ready for it.
A．hold; will hold B．will hold; hold
C．hold; hold D．will hold; will hold
4．—I don't know if it tomorrow.
—Well, if it , the school sports meeting will be cancelled.
A．will rain；will rain B．rains；will rain C．will rain；rains
5．—Let's go fishing if it ____ this weekend.
—But nobody knows if it ____.
A．is fine; will rain B．will be rain; rains
C．will be fine; will rain D．is fine; rains
6．Not only my parents but also my sister______ crazy about shopping online.
A．am B．is C．are D．be
7．Very little of the house _______ now because it caught fire last week.
A．remains B．is remaining C．is remained D．remained
8．Amy's father________ angry when he_________ the news.
A．will get; will hear B．gets; will hear
C．will get; hears D．gets; heard
9．Our Geography teacher told us that the Earth ____________ the sun.
A．went around B．goes around
C．is going around D．was going around
10．My husband me flowers every week before we got married, but now he never .
A．sent; does B．sends; does
C．was going to send; do D．sent; do
11．—I don't know when tomorrow.
—I will call you as soon as he .
A．will he come; arrives B．he will come; arrives
C． he will come; will arrive D．he comes; will arrive
12．I don't know if he tomorrow. If he , I'll call you at once.
A．comes, comes B．will come; comes C．will come, will come
13．Not only Li Ming but also his parents ______ in Canada now.
A．is B．are C．was D．were
14．If he _____ the money, he _____ a lot of clothes.
A．has; will buy B．had; bought
C．had; would buy D．had; will buy
15．Will you get wet if I ______ the experiment?
A．will do B．do C．does D．did
16．The children will climb the mountain if it________ tomorrow.
A．won't rain B．didn't rain C．isn't raining D．doesn't rain
17．She _____ out alone at night.
A．dare not to go B．dares not go
C．doesn't dare to go D．doesn't dares go
18．I think joining the English club ________ the best way to improve your English.
A．are B．was C．is D．were
19．She always keeps a balanced diet. It _____ different kinds of foods.
A．include B．includes C．including D．included
20．My father is a tea lover. He __________ tea every day.
A．drink B．drinks C．drank D．will drink
21．Millions of people _________ the Great wall every year.
A．visited B．visit C．will visit D．are vesting
22．I don't know when he _________ tomorrow.
—I will call you as soon as he _________.
A．will come; arrives B．come; will arrive
C．will come; will arrive D．come; arrive
23．We will go for a picnic if it _________ sunny tomorrow.
A．is getting B．gets C．got D．will get
24．Cathy is a teacher. She to Africa to teach English every summer.
A．goes B．went C．is going D．will go
25．Every morning, Nick's mother him to drink more water at school.
A．tells B．tell C．has told D．is telling
26．— What do you often do at weekends?
—I often my grandparents.
A．visit B．visited C．have visited D．will visit
27．—Have you heard of 5G network, Jimmy?
—Yes. When the 5G age ________, the speed will be much faster.
A．comes B．came C．will come D．is coming
28．Xue Zhiqian's latest album Animal World, with his posters, ______well.
A．sells B．sell C．is sold D．are sold
29．—Dad, it is said that the Chang'e-4 spacecraft landed on the far side of the moon. Could you tell me __________?
—Sorry. Let's search for the information on the Internet.1
A．whether it is the first spacecraft to land on the far side of the moon
B．when did the amazing thing happen
C．whether the spacecraft had done experiments or not
D．how long the spacecraft has landed on the far side of the moon
30．Many foreign students to China to study Chinese every year.
A．come B．came C．were coming D．will come
31．Alice and her sister ________ storybooks every evening.
A．read B．are reading C．will read D．have read
32．—Excuse me. Could you wake me up when my friend ________ here?
—Of course. But we still don't know when your friend ________ here.
A．comes, will come B．comes, comes
C．will come, comes D．will come, will come
33．—Which would you prefer, orange juice or coffee?
—Either OK, but I prefer coffee milk.
A．are; to B．is; to C．are; with D．is; with
34．I like soft and gentle music. It _____nice.
A．is sounded B．sounded C．sounds
35．Some people _____ shared bikes to work every day.
A．ride B．rode C．have ridden
36．We will go for a picnic if it ______tomorrow.
A．isn't rain B．doesn't rain C．won't rain
37．My grandfather is a tea lover. He ______ green tea every day.
A．drinks B．is drinking C．drank D．will drink
38．I often _______ to the Capital Library at weekends.
A．go B．went C．will go D．have gone
39．I wonder when they ________ for Beijing. I will go to the train station to see them off when they ________.
A．will leave; leave B．leave; will leave
C．go; leave D．will go; leave
40．Singing is a form of expression that can be understood by everyone. Also, some songs can cheer people up when they _______ in trouble.
A．will be B．aren't C．are
41．Two days enough for me to finish the project. I need a third day.
A．isn't B．is C．aren't D．are
42．Jack ________brush his teeth once a day. But now he ________ doing that twice a day.
A．is used to; used to B．used to; is used to
C．was used to; is used to D．used to; uses to
43．—How do you like western food?
—Well, it's not bad. Now I sandwiches.
A．am used to eat B．used to eat
C．am used to eating D．am used for eating
44．—Will you go for a picnic if it________ tomorrow?
—Sure, I'd love to.
A．doesn't rain B．won't rain C．didn't rain D．isn't raining
45．Tom asks me when I ____ the meeting. He says when I ____ the meeting, telephone him right now.
A．will attend; attend B．will attend; will attend
C．attend; will attend D．attend; attend
46．— Will you go to America next month?
—Yes. But I promise I will call you as soon as I _________there.
A．get to B．will get to C．will get D．get
47．My grandma has three dogs. She _______them every morning.
A．is walking B．has walked C．walks D．walked
48．—Look! Your classroom is so clean.
—Yes. It every day.
A．is cleaned B．was cleaned C．cleans D．cleaned
49．I never _________ that she would come.
A．doubt B．doubted C．no doubt D．doubts
50．—I wonder if he ______ us tonight.
— I believe if he ______ his homework, he will join us.
A．will join; will finish
B．will join; finishes
C．joins; finishes.


答案解析部分
1．C
2．A
3．B
4．C
5．A
6．B
7．A
8．C
9．B
10．A
11．B
12．B
13．B
14．A
15．B
16．D
17．C
18．C
19．B
20．B
21．B
22．A
23．B
24．A
25．A
26．A
27．A
28．A
29．A
30．A
31．A
32．A
33．D
34．C
35．A
36．B
37．A
38．A
39．A
40．C
41．A
42．B
43．C
44．A
45．A
46．D
47．C
48．A
49．A
50．B


初中考英语：语法时态综合强化练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．—Let's go climbing if it ___ tomorrow.
—But nobody knows if it ___tomorrow.
A．won't rain; rains B．doesn't rain; rains
C．doesn't rain; will rain D．won't rain; will rain

全面分析：——如果明天不下雨我们一起去爬山吧。——但是没有人知道是否明天会不会下雨。if引导的条件状语从句，遵循主将从现的原则，第一空，if引导条件状语从句，从句用一般现在时，第一空填doesn't rain，第二空if，是否，引导宾语从句，根据tomorrow，可知宾语从句用一般将来时，第二空填will rain，故选C。

2．It that Yu Mei has changed a lot.
A．seems B．looks like C．seems like D．seemed

全面分析： 于梅似乎改变了很多。根据has changed，可知现在完成时是对现在的影响，故排除D选项，look like，看上去像，不引导从句，it seems that，固定搭配，看上去好像……，故选A。

3．I want to know if they ____ the spring sports meeting next month.
If they ____ it, I must get ready for it.
A．hold; will hold B．will hold; hold
C．hold; hold D．will hold; will hold

全面分析： 我想知道他们是否会参加下个月的春季运动会。如果他们同意，我必须做好准备。第一个空是if引导的宾语从句，next month是将来时的标志，第二个空是if引导的条件状语从句，时态是主将从现，故此处是一般现在时，主语是they复数，谓语动词是动词原形，故选B。

4．—I don't know if it tomorrow.
—Well, if it , the school sports meeting will be cancelled.
A．will rain；will rain B．rains；will rain C．will rain；rains

全面分析：——我不知道明天会不会下雨。——如果下雨，学校运动会将被取消。第一个空是if引导宾语从句，tomorrow是一般将来时标志，故用will rain，第二个空是if引导的条件状语从句，时态是主将从现，故从句是一般现在时，主语是it第三人称单数，故谓语动词是单三式rains，故选C。

5．—Let's go fishing if it ____ this weekend.
—But nobody knows if it ____.
A．is fine; will rain B．will be rain; rains
C．will be fine; will rain D．is fine; rains

全面分析：——如果本周末天晴，我们一起去钓鱼吧。——但是没人知道是否下雨。第一空if引导条件状语从句，条件状语从句遵循主将从现的原则，从句用一般现在时表将来时，故排除BC，第二空前knows后引导宾语从句，描述将来发生的事情，用一般将来时，其结构为will+动词原形，故选A。


6．Not only my parents but also my sister______ crazy about shopping online.
A．am B．is C．are D．be

全面分析：不仅我父母，我妹妹也着迷网上购物。描述客观事实，用一般现在时，not only…but also连接并列的主语时，遵循就近原则，根据my sister，名词单数，be动词用is，故选B。


7．Very little of the house _______ now because it caught fire last week.
A．remains B．is remaining C．is remained D．remained

全面分析： 房子几乎没剩下什么东西了，因为上周失火了。remain剩余，保持，不及物动词，所以没有进行时，也不用被动语态，故排除B和C；根据句中now可知，此处表示目前存在的状态，所以用一般现在时，故选A。

8．Amy's father________ angry when he_________ the news.
A．will get; will hear B．gets; will hear
C．will get; hears D．gets; heard

全面分析：艾米的爸爸当听到这则消息后将会生气的。get，变得；hear，听到；when引导的时间状语从句遵循主将从现的原则。故排除AB，分析句子，动作还未发生，主句应用一般现在时，从句用一般现在时代替一般将来时，故选C。


9．Our Geography teacher told us that the Earth ____________ the sun.
A．went around B．goes around
C．is going around D．was going around

全面分析： 我们的地理老师告诉我们地球绕着太阳转。地球绕着太阳转是客观事实，故用一般现在时，故选B。

10．My husband me flowers every week before we got married, but now he never .
A．sent; does B．sends; does
C．was going to send; do D．sent; do

全面分析：在我们结婚之前，我丈夫每周都给我送花，但现在他不送了。第一个空，根据时间状语 every week before we got married，可知句子时态用一般过去时，send的过去式为sent，排除B、C选项；第二个空，根据now可知句子时态用一般现在时或现在进行时，主语he是第三人称单数，所以助动词用does，排除D选项，故选A。

11．—I don't know when tomorrow.
—I will call you as soon as he .
A．will he come; arrives B．he will come; arrives
C． he will come; will arrive D．he comes; will arrive

全面分析：我不知道他明天什么时候会来。他一来我就会给你打电话的。第一个空为宾语从句。主句为一般现在时从句可以为任何时态，因从句中有tomorrow，故从句使用一般将来时；宾语从句的语序是用陈述语序，排除A；第二个空为时间状语从句。主句是一般将来时，从句是用一般现在时代替将来时。故选B。

12．I don't know if he tomorrow. If he , I'll call you at once.
A．comes, comes B．will come; comes C．will come, will come

全面分析： 我不知道他明天是否回来。如果他来，我会马上打电话给你。第一个空，根据tomorrow，可知宾语从句是时态是一般将来时，第二个空是if 引导的条件状语从句，时态是主将从现，故此处是一般现在时，故选B。

13．Not only Li Ming but also his parents ______ in Canada now.
A．is B．are C．was D．were

全面分析： 现在不仅李明，而且他的父母也在加拿大。根据now，可知时态是一般现在时，主语是 his parents，复数，故用be动词用are，故选B。

14．If he _____ the money, he _____ a lot of clothes.
A．has; will buy B．had; bought
C．had; would buy D．had; will buy

全面分析：如果他有钱，他会买许多衣服。if引导的时间状语从句遵循主将从现的原则，即主句用一般将来时，从句用一般现在时，从句主语是he，动词用三单形式，have有，其三单是has，主句用一般将来时，其结构为will+动词原形，buy买，动词原形，bought是buy的过去式，故选A。


15．Will you get wet if I ______ the experiment?
A．will do B．do C．does D．did

全面分析： 如果我做实验，你会淋湿吗？if引导的条件状语从句，时态是主将从现，从句主语是 I，故谓语是动词原形，故选B。

16．The children will climb the mountain if it________ tomorrow.
A．won't rain B．didn't rain C．isn't raining D．doesn't rain

全面分析：如果明天不下雨，孩子们会去爬山。if 引导的条件状语从句遵循主将从现的原则，主句用一般将来时，从句用一般现在时，从句是一个否定句，含有实义动词rain的否定句，要借助助动词don't/doesn't构成，主语是it，助动词用doesn't，故选D。


17．She _____ out alone at night.
A．dare not to go B．dares not go
C．doesn't dare to go D．doesn't dares go

全面分析：晚上她不敢一个人出去。dare可以作情态动词也可以作行为动词，作情态动词时，后面直接跟动词原形，没有人称与数的变化，构成否定时直接在dare后加not，作行为动词时后跟动词不定式，构成否定需要助动词，故答案是C。

18．I think joining the English club ________ the best way to improve your English.
A．are B．was C．is D．were

全面分析： 我认为加入英语俱乐部是提高英语水平的最好方法。描述客观事实用一般现在时，主语是动名词joining，谓语是单三式，故be用is，故选C。

19．She always keeps a balanced diet. It _____ different kinds of foods.
A．include B．includes C．including D．included

全面分析：她总是保持均衡饮食。均衡饮食包括不同种类的食物。include在句中作谓语，故排除非谓语形式including，根据 She always keeps a balanced diet. 可知句子时态为一般现在时，主语It是第三人称单数，谓语动词使用单三形式，故答案是B。

20．My father is a tea lover. He __________ tea every day.
A．drink B．drinks C．drank D．will drink

全面分析：我爸爸是一个茶痴，他每天都喝茶。every day表明时态是一般现在时，主语是he，所以drink用drinks，C是一般过去时；D是一般将来时，故选B。

21．Millions of people _________ the Great wall every year.
A．visited B．visit C．will visit D．are vesting

全面分析：成千万的人每年参观长城。根据every year，可知句子时态为一般现在时，故答案是B。

22．I don't know when he _________ tomorrow.
—I will call you as soon as he _________.
A．will come; arrives B．come; will arrive
C．will come; will arrive D．come; arrive

全面分析：——我不知道他明天什么时候回来。——他一回来我就给你打电话。第一句是宾语从句，根据tomorrow，可知使用一般将来时，第二句是时间状语从句，在时间状语从句中应遵循主将从现的原则，所以使用一般现在时，故答案是A。

23．We will go for a picnic if it _________ sunny tomorrow.
A．is getting B．gets C．got D．will get

全面分析：如果明天天气晴朗，我们将去野餐。这是一个条件状语从句，在条件状语从句中，应遵循主将从现的原则，所以从句使用一般现在时表示将来。故答案是B。

24．Cathy is a teacher. She to Africa to teach English every summer.
A．goes B．went C．is going D．will go

全面分析：凯西是个老师。她每年夏天都去非洲教英语。固定短语go to Africa，去非洲；根据题干中的every summer可知，此句要用一般现在时，因主语she是第三人称单数形式，谓语动词要用goes，故选A。

25．Every morning, Nick's mother him to drink more water at school.
A．tells B．tell C．has told D．is telling

全面分析：每天早上，尼克的妈妈都告诉他在学校要多喝水。固定结构tell sb to do sth，告诉某人做某事；根据题干中的every morning可知，此句要用一般现在时，主语Nick's mother 是第三人称单数形式，谓语动词要用tells，故选A。

26．— What do you often do at weekends?
—I often my grandparents.
A．visit B．visited C．have visited D．will visit

全面分析：——你周末经常做什么？——我经常去看我的祖父母。根据上句 What do you often do at weekends? 用一般现在时，可知答语也要用一般现在时，主语I，谓语动词visit，要用动词原形visit，故选A。


27．—Have you heard of 5G network, Jimmy?
—Yes. When the 5G age ________, the speed will be much faster.
A．comes B．came C．will come D．is coming

全面分析：——吉米，你听说过5G网络吗？——是的，当5G时代来临的时候，网速会更快。when引导的时间状语从句，遵循主将从现原则，空格所在的句子是从句，因此用comes，故选A。

28．Xue Zhiqian's latest album Animal World, with his posters, ______well.
A．sells B．sell C．is sold D．are sold

全面分析：薛之谦最新的唱片《动物世界》还有海报卖的很好。这是一般性的描述，应使用一般现在时，sell可以用主动表被动，主语album是第三人称单数，谓语动词使用单三形式，故答案是A。

29．—Dad, it is said that the Chang'e-4 spacecraft landed on the far side of the moon. Could you tell me __________?
—Sorry. Let's search for the information on the Internet.1
A．whether it is the first spacecraft to land on the far side of the moon
B．when did the amazing thing happen
C．whether the spacecraft had done experiments or not
D．how long the spacecraft has landed on the far side of the moon

全面分析：爸爸，据说嫦娥4号太空飞船抵达月球较远的那边。你能告诉我是否这是第一艘抵达月球较远的那边的太空飞船吗？tell后接宾语从句，从句应用陈述句语序，故排除B，描述客观事实，应用一般现在时，故排除CD，故选A。

30．Many foreign students to China to study Chinese every year.
A．come B．came C．were coming D．will come

全面分析：许多外国学生每年来中国学习汉语。A.一般现在时；B.一般过去时；C.过去进行时；D.一般将来时。every year是一般现在时的标志词，故选A。

31．Alice and her sister ________ storybooks every evening.
A．read B．are reading C．will read D．have read

全面分析：Alice和她妹妹每天晚上都读故事书。根据时间状语 every evening，每天晚上，可知为习惯性、经常性发生的事，应用一般现在时；再根据主语Alice and her sister Alice和她妹妹，可知谓语用动词原形。故选A。

32．—Excuse me. Could you wake me up when my friend ________ here?
—Of course. But we still don't know when your friend ________ here.
A．comes, will come B．comes, comes
C．will come, comes D．will come, will come

全面分析：——对不起。当我朋友来的时候你能叫醒我吗？——当然。但我们仍然不知道你的朋友什么时候会来。第一句when引导的是时间状语从句，要用一般现在时，my friend 是主语，谓语动词要用第三人称单数形式；第二句when引导的是宾语从句，因朋友还没有来，语句要用一般将来时。故选A。

33．—Which would you prefer, orange juice or coffee?
—Either OK, but I prefer coffee milk.
A．are; to B．is; to C．are; with D．is; with

全面分析：——你喜欢哪种，橙汁还是咖啡？——两者都可以，但我更喜欢加牛奶的咖啡。英语中，either 在句中做主语谓语动词一般现在时用单数，第一空应用is；根据but可知，应该是更喜欢带有牛奶的咖啡，with拥有，带有，第二空应用with；故选D。


34．I like soft and gentle music. It _____nice.
A．is sounded B．sounded C．sounds

全面分析：我喜欢轻音乐。它听起来很好。句子时态是一般现在时，sound是系动词，不能用于被动，后跟形容词，故选C。


35．Some people _____ shared bikes to work every day.
A．ride B．rode C．have ridden

全面分析：有些人每天骑共享单车上班。结合every day，可知表达的是经常性的动作故用一般现在时，主语some people，故ride，故选A。


36．We will go for a picnic if it ______tomorrow.
A．isn't rain B．doesn't rain C．won't rain

全面分析：如果明天不下雨，我们就去野餐。这是汉语条件状语从句的主从复合句，主句用一般将来时，从句用一般现在时，谓语动词rain是实意动词，在否定句中借助于助动词do的否定结构，主语it是第三人称单数，助动词用doesn't，故选B。


37．My grandfather is a tea lover. He ______ green tea every day.
A．drinks B．is drinking C．drank D．will drink

全面分析：我祖父是个爱喝茶的人。他每天喝绿茶。固定短语，drink tea，喝茶；根据题干中的every day，可知此句要用一般现在时；又因主语my grandfather是第三人称单数形式，谓语动词要用第三人称单数形式，故选A。

38．I often _______ to the Capital Library at weekends.
A．go B．went C．will go D．have gone

全面分析：我经常在周末去首都图书馆。根据频率副词often，经常，可知谓语动词要用一般现在时，主语时 I，要用动词原形go，故选A。


39．I wonder when they ________ for Beijing. I will go to the train station to see them off when they ________.
A．will leave; leave B．leave; will leave
C．go; leave D．will go; leave

全面分析：我想知道他们什么时候去北京。当他们离开的时候，我将去车站送他们。leave for，动身前往，去……。第一句话是宾语从句，因此从句可以使用一般将来时，第二句是when引导的时间状语从句，应遵循主将从现的原则，因此应使用一般现在时，故答案是A。

40．Singing is a form of expression that can be understood by everyone. Also, some songs can cheer people up when they _______ in trouble.
A．will be B．aren't C．are

全面分析：歌唱是每个人都能理解的一种表现形式。另外，当人们遇到困难时，一些歌曲可以使他们振作起来。when引导的时间状语从句，主从句时态保持一致，主句是一般现在时，可知从句用一般现在时；根据 some songs can cheer people up，可知是歌曲能使陷入麻烦的人振作，所以从句是肯定结构，故选C。

41．Two days enough for me to finish the project. I need a third day.
A．isn't B．is C．aren't D．are

全面分析：两天还不够我完成这个项目。我需要第三天。two days，两天，一段时间，做主语时，谓语动词要用单数；根据后句 I need a third day. 可知两天是不够用，要用否定句。故选A。


42．Jack ________brush his teeth once a day. But now he ________ doing that twice a day.
A．is used to; used to B．used to; is used to
C．was used to; is used to D．used to; uses to

全面分析：杰克过去每天刷牙一次。但现在他习惯了一天做两次。used to do sth，过去常常做某事； be used to doing sth.习惯做某事。都是固定搭配。根据第一个空格后的brush，动词原形，要用used to do sth.；根据空格后doing，要用be used to doing sth.由 now，可知要用一般现在时，主语he，be要用is，故选B。


43．—How do you like western food?
—Well, it's not bad. Now I sandwiches.
A．am used to eat B．used to eat
C．am used to eating D．am used for eating

全面分析：——你喜欢西餐吗？——嗯，还不错。现在我习惯吃三明治了。used to do sth.过去常常做某事；be used to doing sth.习惯做某事。be used for doing sth.被用来做某事。根据答语 Now I sandwiches.可知现在习惯于吃三明治，故选C。

44．—Will you go for a picnic if it________ tomorrow?
—Sure, I'd love to.
A．doesn't rain B．won't rain C．didn't rain D．isn't raining

全面分析：——如果明天不下雨，你会去野餐吗？——当然，我会去。if引导的条件状语从句，时态是主将从现，故是一般现在时，故选A。

45．Tom asks me when I ____ the meeting. He says when I ____ the meeting, telephone him right now.
A．will attend; attend B．will attend; will attend
C．attend; will attend D．attend; attend

全面分析：汤姆问我什么时候参加会议。他说当我出席会议时，马上给他打电话。根据语境可知，第一个分句是when 引导的宾语从句，要用一般将来时，will attend；第二个分句是when 引导的时间状语从句，从句用一般现在时，故选A。


46．— Will you go to America next month?
—Yes. But I promise I will call you as soon as I _________there.
A．get to B．will get to C．will get D．get

全面分析：——下个月你将要去美国吗？——是的。但是我保证我一到达那里，就给你打电话。由句子结构可知是含有时间状语从句的复合句：主句要用一般将来时，从句要用一般现在时，主语I，谓语动词要用原形；there是副词，前面不加介词，要用get there，到达那里。故选D。


47．My grandma has three dogs. She _______them every morning.
A．is walking B．has walked C．walks D．walked

全面分析： 我奶奶有三只狗，她每天早晨去遛它们。A.现在进行时；B.现在完成时；C.一般现在时；D.一般过去时。根据every morning，可知是一般现在时的标志，主语是she，所以用动词walks，故答案选C。

48．—Look! Your classroom is so clean.
—Yes. It every day.
A．is cleaned B．was cleaned C．cleans D．cleaned

全面分析：——看，你的教室是如此的干净。——是的。每天都打扫它。根据 Your classroom is so clean. 可知，答语的it，指代教室，教室被打扫，所以此句应该用被动语态，且every day，每天，所以应该用一般现在时，所以用is cleaned，表示被动，故选A。

49．I never _________ that she would come.
A．doubt B．doubted C．no doubt D．doubts

全面分析：我从不怀疑她回来。根据never可知用一般现在时，主语是第一人称，故排除BD选项，根据句意，应用doubt，怀疑，故选A。

50．—I wonder if he ______ us tonight.
— I believe if he ______ his homework, he will join us.
A．will join; will finish
B．will join; finishes
C．joins; finishes.

全面分析：——我想知道他今天晚上是否加入我们吗？——我相信如果他完成了作业，他会加入我们的。根据句式结构第一句是if是否，引导宾语从句，根据tonight，可知从句是将来时态；第二句if如果，引导条件状语从句，时态为主将从现，此空用一般现在时，finishes，故选B。