---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
考查情態(tài)動(dòng)詞。句意為：上句是你對(duì)Julia說什么了？ 我看見她一個(gè)人在宿舍哭呢； 下句是不可能是我的錯(cuò)，當(dāng)我和她在教室的時(shí)候我們談的很高興。couldn’t have done表示不可能，所以選D 。
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