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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

【解析】

試題分析：句意：句意為：她看上去很高興，一定是通過了考試。因為前面她很開心了，所以推斷她肯定是通過了考試了，因為這個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: 考查情態(tài)動詞

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