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请帮我做几道英语选择题.并作简要分析.分别是什么时态

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请帮我做几道英语选择题.并作简要分析.分别是什么时态
( ) 1.He ____ TV at seven last night.
\x05A.watches B.watched C.is watching D.was watching
( ) 2.By the end of last term,we _____ ten lessons.
\x05\x05A.learned B.have learned
\x05C.has learned D.had learned
( ) 3.The train _____ before we went to the station.
\x05 A.leaves B.left C.has left D.had left
( ) 4.While I ____ lunch,he came in.
\x05\x05A.had B.have C.am having D.was having
( ) 5.She said she _____go to Beijing the next week.
\x05A.is going to B.would C.was going D.could
( ) 6.She ______Beijing three times.
\x05A.has been to B.has gone to C.have been to D.have gone to
( ) 7.I _______ the text when the teacher came in.
\x05A.am reading B.was reading
\x05C.have read D.have been reading
( ) 8.Great changes _____ in China in the past 20 years.
\x05A.take place \x05\x05 B.took place
\x05C.have taken place \x05D.has taken place
( ) 9.He_______ the city since 2008.
A.lives B.lived C.has lived D.have lived
( ) 10.He ______ the army for three years.
A.joined B.has joined C.was in D.has been in
1. D, at seven last night 是标志,过去具体时间发生的事情,过去进行时;
2. D, by the end of last term 是标志,上学期末为止,过去完成时;
3. D, before we went是标志,在过去的一个动作之前发生的动作,多用现在完成时;
4. D, while常用语两个同时发生的动作,引导一个进行时,
5. B, said的宾语从句里表示将要做某事,用过去将来时.
6. A. 表示去过某地多少次用现在完成时的been to 结构,主语单三,故has been to;
7. B, 我很引导的表示两个动作同时发生,一个用过去时,另一个用过去进行时态,
8. C, In the past 20 years 表示一个时间段,动作一直在持续,故用现在完成时,且主语是复数;
9. C, since2008用现在完成时,主语单三;
10. D. for three years 表示持续的时间,是现在完成时,且动词要用延续性动词.