问题
选择题
---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 been
B．should have been
C．shouldn’t have been
D．couldn’t have been
答案
答案：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 。