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----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.
A  must have   B could have   C should have  D might have
A
本题考查情态动词的用法。句意:玛丽看起来很沮丧。她一定没有通过考试。must have done过去一定做过某事。
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