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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:2002

____ is known to us all that the old scientist , for ____ life was 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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____ is known to us all that t