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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1055

The runners________ several times ________their positions on the starting line, otherwise they will be kicked out.

A.are warned, making up B.warn, to make up
C.have been warned, to take up D.warn, to have taken up
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Therunnersseveraltimestheirpos