13*The young girl sitting next to me on the plane was very nervous. She ____ before.
A. hasn’t flown
B. didn’t fly
C. hadn’t flown
D. wasn’t flying
答案是C。过去紧张，过去的过去没坐过飞机。过去完成时。第一句话的谓语是was，一般过去时。
14*-- Jim, have you finished reading Harry Potter and Half-Blood Prince ?
--- No. I ______ my father on the farm all yesterday.
A. would help
B. had helped
C. was helping
D. have been helping
答案是C。过去进行时，表示昨天一整天都在帮爸爸干活。D是现在完成进行，表示从过去到现在一直做某事。
15*He will have learned English for eight years by the time he ________ from the university next year.
A. will graduate
B. will have graduated
C. graduates
D.is to graduate
graduate 动词，毕业
答案是C。主将从现。by the time 后面water everywhere的从句用一般现在时表将来。
16*— "May I go now?"
— -"No, you ________. "
A. mustn't
B. needn't
C. mightn't
D. won't
答案是A。这个不是must 的问句。
我可以走了吗？
不，你不能走。不能=禁止，不可以，不允许
17*--Don‘t forget to post the letter for me.
— I _____.
A. won‘t
B. will
C. don‘t
D. can‘t
答案是A。
别忘了帮我寄这封信。
A我不会忘的
B就忘
18*By the time the course ends, ______ a lot about Britain.
A. we’ll learnt
B. we are learning
C. we have learnt
D. we’ll have learnt
答案是D，看清楚选项就行。
19*I have to see the doctor because I ____ a lot lately.
A. have been coughing
B. had coughed
C. coughed
D. cough
答案是A。最近一直咳嗽，最近=从过去到现在，现在完成进行时。lately 最近
20*She was surprised to find the fridge empty; the child _____ everything!
A. had been eating
B. had eaten
C. have eaten
D. have been eating
案是B。她很惊讶地发现冰箱空了。孩子们把东西都吃了。不是从过去的过去到过去一直吃，是吃完了，造成的影响是冰箱空了。
21*---I don't suppose the police know who did it.
——Well, surprisingly they do. A man has been arrested and ________ now.
A. has been questioned
B. is being questioned
C. is questioning
D. has questioned
答案是B。AB是被动语态。一个人被抓住了，正在被审问。现在进行时的被动语态。
question 动词，提问，审问，询问，质疑。
22*She had written a number of books _____ the end of last year.
A. for
B. in
C. by
D. at
答案是C，at the end of last year 在去年年底，一般过去时
by the end of last year 在去年年底之前，过去完成时
看好已知的时态。
23* Peter __________ come with us tonight, but he isn't very sure yet.
A. must
B. can
C. may
D. will
答案是C。今晚上有可能来，但是不确定。can一般用在疑问句和否定句中表示可能性
24*The grass has grown so tall that it needs _________.
A. to cut
B. to be cut it
C. cutting
D. being cut
答案是C。need+ doing ，doing 表示被动。草长得太高了，需要（被）修剪。B选项把最后的it去掉就对了。
1*She showed him the photo she __the day before.
A has taken
B took
C was taking
D had taken
答案是D。给我看照片是过去，拍照是过去的过去，过去完成时
the day before 前一天，头一天
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