is known to us all is that the old scientist, for_life w

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__is known to us all is that the old scientist, for___life was hard in the past,still works very hard in the past, still works very hard in his eighties.
A. It; whose B. As, whom C What , whom D. as ;whose

C
前面是what 引导的主语从句；后面是for whom引导的定语从句,原型为sth is + adj for sb.

__is known to us all is that the old scientist, for___life w __is known to us all is that the old scientist,for___life wa 35 .is known to us all is that the old scientist,for life wa __is well known to us all is that the 2010 world expo will b __is known to us all is that America is a developed country_ （）is known to us all is that the old worker ,for ()life was what is known to us all is that the old scirntist,for whom l ____is known to us all is that the old writer,for ____ life it is known to us all that the old scientists,for whom life __is well known to all,the earth is round填as or it or that As is all known to us all,there is an old saying that "Where What we all know is that the old gentleman, for___life was h