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【题目】—Guess what!I have got A for my term paper.

—Great!You ________ read widely and put a lot of work into it.

A. must B. should

C. must have D. should have

【答案】C

【解析】本题考查情态动词的用法。由“have got A”可知是对过去发生事情的推测,故用情态动词+have done”结构。must have done表示必定做过某事,符合题意。

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