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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 322

Tom was about to close the window __________ his attention was caught by a bird.

A.when
B.if
C.and
D.till
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Tomwasabouttoclosethewindowhis