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.

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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.
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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.
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.

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.
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.

可以用过去完成时,可是选项里面没有提供。所以,对比下来,只有C最好了。