作业帮They ( ) the film at that time.
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They ( ) the film at that time.
A.may see B.mustn't see C.must have seen D.can have seen 书上答案是c,为什么不用过去完成式?求帮忙分析.
A.may see B.mustn't see C.must have seen D.can have seen 书上答案是c,为什么不用过去完成式?求帮忙分析.
at that time是表示故去时间的状语,不可以用过去完成时态.此题目考查情态动词表推测的用法,选择C.
They (must have seen ) the film at that time.
翻译：那时侯他们一定是看电影.
再问： They (must have seen ) the film at that time.是不是现在完成式？
再答： 不是现在完成时，而是对过去的推测判断。又如：He must have gone to the Great Wall last Sunday。上周日他一定是去长城了。
They (must have seen ) the film at that time.
翻译：那时侯他们一定是看电影.
再问： They (must have seen ) the film at that time.是不是现在完成式？
再答： 不是现在完成时，而是对过去的推测判断。又如：He must have gone to the Great Wall last Sunday。上周日他一定是去长城了。
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