–She looks very happy. She ________have passed the exam.
--I guess so. It’s not difficult after all.
A．shouldB．mustC．couldD．might
B

試題分析：考查情態(tài)動(dòng)詞用法。A應(yīng)該；B必須，一定；C可能；D也許。Must have done一定做了某事；句意：—她看起來很開心。她一定已經(jīng)通過了考試�！艺J(rèn)為如此。它一點(diǎn)也不難。根據(jù)句意說明是對(duì)過去所發(fā)生的事情的肯定的推測(cè)用must have done.故B正確。
點(diǎn)評(píng)：情態(tài)動(dòng)詞的詞義辨析也要放在上下文語境中進(jìn)行，要注意不同的其它動(dòng)詞與have done連用的詞義的差別。
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