【題目】He realized that someone __________ his room. Something important was missing.

A. shouldn’t have enteredB. could have entered

C. can’t have enteredD. must have entered

【答案】D

【解析】

考查情態(tài)動(dòng)詞+have done。句意：他意識(shí)到一定有人進(jìn)過他的房間。某個(gè)重要的東西丟了。must have done意為“肯定做過某事”，是對(duì)過去事情的肯定推測(cè)。分析句意可知， must have entered符合句意。故D選項(xiàng)正確。

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