------She looks very happy. She ______ have passed the exam.
------I guess so. It’s not difficult after all.
A．shouldB．couldC．mustD．might
C
考查情態(tài)動詞用法。Should have done本應(yīng)該做某事實際上卻未做；could have done本可以做卻未做；must have done一定做了某事；might have done也許做了某事。句意：—她看上去很開心，她肯定通過了考試。—我猜是這樣。畢竟試卷不難。
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