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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较难
  • 浏览 369

John was about to go back to sleep ______ suddenly his bedroom became as bright as day.

A.after B.when C.while D.until
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Johnwasabouttogobacktosleepsud