—I called you yesterday morning. A girl answered, but I didn’ t recognize the voice. —Oh, it______my younger sister, she was in

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问题 —I called you yesterday morning. A girl answered, but I didn’ t recognize the voice. —Oh, it______my younger sister, she was in my room at that moment.

选项 A、must be
B、must have been
C、might be
D、can have been

答案B

解析 考查情态动词表示推测。句意:——我昨天早上打电话给你。一个女孩接的,但我没听出是谁的声音。——哦,一定是我的小妹妹。她那会正在我的房间。A和B都表示“一定是”,但根据句子时态是过去时,应该用表示对过去的推测的must have been。对于C、D两项,表示过去的可能性用might have been或者could have been,没有C、D两项这样的用法。故答案为B。
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