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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 容易
  • 浏览 1756

They were surprised that a four-year-old boy should work out such a difficult problem
____they themselves couldn’t.

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