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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1485

.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,thenois