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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1128

At the beginning of the class, the noise of doors__________ could be heard many times.

A.opened and closed
B.to be opened and closed
C.being opened and closed
D.to open and close
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Atthebeginningoftheclass,theno