---I have looked for my keys everywhere, but I can’t find them.

---Sorry to hear that. You _____ them somewhere.

A. must lose B. should lose

C. must have lost D. should have lost

 

C

【解析】

試題分析：考查情態(tài)動詞和虛擬語氣。句意：--我到處找我的鑰匙，但就是找不到。--聽到這我很抱歉。你一定是把它們忘在某個地方了。情態(tài)動詞+have done表示對過去的事情進行虛擬，must have done一定已經(jīng)做了某事；should have done本應(yīng)該做某事，根據(jù)句意可知，這里表示肯定的推測，故選C。

考點：考查情態(tài)動詞和虛擬語氣

 

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