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—Did Ann fail in English?
—She ________. Don't you notice that she looks depressed?
A.mightB.must
C.may haveD.could have
C
C 考察情态动词。句义:—安妮通过了英语考试了吗?—她没有通过。你没有看到他很失落吗?由句义可知,这是对过去事情的推测。所以排除AB项。D项意为“本来能够通过考试”。
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