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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 1264

   is known to us all that the old scientist,for    life is hard in the past,still works hard in his eighties.

A.It;whom B.As;whom C.As;whose D.What:whom
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isknowntousallthattheoldscient