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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 524

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________ on the subject for half an hour, Liu Ying suddenly stopped.

A.To be worked B.To work
C.Having worked D.Having been worked
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.onthesubjectforhalfanhour,Liu