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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1261

- Someone is knocking at the door. Is it Ann?
- It_______ be her. She is giving a performance at the theatre now.

A.may B.must
C.can't D.mustn't
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Someoneisknockingatthedoor.Isi