---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 beenC.shouldn’t have beenD.couldn’t have been
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D解析考查情态动词。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 。