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——She looks very happy. She       have passed the exam.    

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

A. should           B. could           C. must            D. might

 

C

【解析】

试题分析:句意为:她看上去很高兴,一定是通过了考试。因为前面她很开心了,所以推断她肯定是通过了考试了,因为这个推断的可能性比较大,所以用must have done“过去一定做了could have done本可以做却没有做,might have done过去可能做了,所以选C

考点:考查情态动词

 

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