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--- Guess what! I have got A for my term paper.
--- Great! You _____ read widely and put a lot of work into it..

A.mustB.should
C.must haveD.should have

C

解析试题分析: 情态动词表肯定推测。题意,猜猜看,我得了A。 棒极,人肯定付出很多努力。根据上句中have done 得了事情已经发生,所以表示对过去的肯定推测,用must have done .故选 C项。
考点 情态动词

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