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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1815

They were surprised that a child could work out the problem____they themselves couldn't.

A.once    B.while C.then    D.if
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Theyweresurprisedthatachildcou