问题标题：
__isknowntousallisthattheoldscientist,for___lifewashardinthepast,stillworksveryhardinthepast,stillworksveryhardinhiseighties.A.It;whoseB.As,whomCWhat,whomD.as;whose
问题描述：
__isknowntousallisthattheoldscientist,for___lifewashardinthepast,stillworksveryhardinthepast,stillworksveryhardinhiseighties.
A.It;whoseB.As,whomCWhat,whomD.as;whose
彭奕文回答：
C
前面是what引导的主语从句；后面是forwhom引导的定语从句,原型为sthis+adjforsb.
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