--Mary looks very upset. She failed to pass the exam.I guess so. It's very dif
--Mary looks very upset. She failed to pass the exam.I guess so. It's very dif
发布时间：2020-08-16 22:12:21
----- 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
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解析：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。