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---What did you say to Julia? I saw her crying in the dormitory alone.
--- It ______ my fault. We talked happily when I was with her in the classroom.
A.mustn’t have beenB.should have been
C.shouldn’t have been D.couldn’t have been
D
考查情态动词。句意为:上句是你对Julia说什么了? 我看见她一个人在宿舍哭呢; 下句是不可能是我的错,当我和她在教室的时候我们谈的很高兴。couldn’t have done表示不可能,所以选D 。
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