—Did Ann fail in English?
—She ________. Don't you notice that she looks depressed?
A．mightB．must
C．may haveD．could have
C
C 考察情態(tài)動詞。句義：—安妮通過了英語考試了嗎？—她沒有通過。你沒有看到他很失落嗎？由句義可知，這是對過去事情的推測。所以排除AB項。D項意為“本來能夠通過考試”。
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