【題目】—The expression on his face suggests he ________ have failed in the competition.

—I guess so. It’s not easy after all.

A. should B. could

C. must D. might

【答案】C

【解析】考查情態(tài)動詞。此處must have done sth.表示對過去事情有把握的推測。句意：——他的面部表情表明他一定比賽失敗了�！蚁胧前��？荚嚠吘共蝗菀�。

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