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

问题描述:

______ 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
为什么选A?
顺便参考一下这个:
题目相同·答案不同……

___is known to us all that the old scientist,for ___ life was hard in the past,still works hard in his eighties.___is known to us all (注意这里)is that the old scientist,for ___ life was hard in the...