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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 283

At the beginning of class, the noise of desks        could be heard outside the classroom.

A.opened and closed
B.to be opened and closed
C.being opened and closed
D.to open and close
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Atthebeginningofclass,thenoise