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–She looks very happy. She ________have ...

–She looks very happy. She ________have passed the exam.

--I guess so. It’s not difficult after all.

A.should

B.must

C.could

D.might

 

B 【解析】 试题分析:考查情态动词用法。A应该;B必须,一定;C可能;D也许。Must have done一定做了某事;句意:—她看起来很开心。她一定已经通过了考试。—我认为如此。它一点也不难。根据句意说明是对过去所发生的事情的肯定的推测用must have done.故B正确。 考点:考查情态动词用法
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