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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1973

In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.

A.signal B.chance C.mark D.measure
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Inourclass,whenthebellrangandt