题目

__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

提问时间：2020-10-15

答案

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.