—He looks very happy. He______have passed the exam. —I guess so. It’s not difficult after all.

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问题 —He looks very happy. He______have passed the exam. —I guess so. It’s not difficult after all.

选项 A、should
B、could
C、must
D、might

答案C

解析 考查情态动词表推测的用法。根据所提供的情景“他看上去很高兴”可推测他一定通过了考试。should have done“本应该做却没有做”,could have done“本可以做却没有做”,must have done“过去一定做了”,might have done“过去可能做了”。故本题选C。
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