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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 2003

79. Before there goes the bell for class, our math teacher took out a piece of       and wrote his problems on the blackboard.

A.brush pen B.chalk C.paper D.Pencil
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79.Beforetheregoesthebellforcl