— 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】

試題分析：考查情態(tài)動(dòng)詞。句意 猜猜看，我記得演講比賽第一名。祝賀你，你肯定是投入很多精力在這上面。根據(jù)上文提到已經(jīng)取得成功，故表示對(duì)過(guò)去的肯定推測(cè) ，所以選D項(xiàng)。

考點(diǎn) : 考查情態(tài)動(dòng)詞

 

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