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----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.
A． must haveB．could haveC．should haveD．might have
Ａ
考察情態(tài)動詞用法。Must have done一定做了某事；could have done本可以做某事；should have done sth本應(yīng)該做某事；might have done也許做某事；結(jié)合句意可知A正確。句意：—瑪麗看起來很難過。她一定考試沒有及格。
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