—She looks very happy. She have passed the exam—I guess so. It’s not difficult after a

—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

A. shouldB. could(答案→)C. mustD. might解析： 试题分析: 句意：——她看上去非常开心。她肯定通过考试了。——我认为是这样。考试一点也不难。must have done “肯定做过某事”是对过去发生事情的肯定推测，might have done和 could have done表示“可能做过某事”；should have done“本应该做但是没做”，根据句意判断C选项正确。

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