——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】

試題分析：句意為：她看上去很高興，一定是通過了考試。因?yàn)榍懊嫠荛_心了，所以推斷她肯定是通過了考試了，因?yàn)檫@個(gè)推斷的可能性比較大，所以用must have done“過去一定做了”，could have done本可以做卻沒有做，might have done過去可能做了…，所以選C。

考點(diǎn)：考查情態(tài)動(dòng)詞

 

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