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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:463

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

A.As; whom B.What; whom C.It; whose D.As; whose
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isknowntousallisthattheoldscie