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— Guess what! I have won the first prize in the speaking competition.

— Congratulations! You _____ put a lot of work into it.

A. should B. must C. should have D. must have

 

D

【解析】

试题分析:考查情态动词。句意 猜猜看,我记得演讲比赛第一名。祝贺你,你肯定是投入很多精力在这上面。根据上文提到已经取得成功,故表示对过去的肯定推测 ,所以选D项。

考点 : 考查情态动词

 

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