is known to us all isthe old scientist for whom life was hard in the past still works v

问题补充：

is known to us all isthe old scientist, for whom life was hard in the

past, still works very hard in his eighties.

A. What; what

B. What; that

C. That; what

D. As; that

答案：

A. What; what

(答案→)B. What; that

C. That; what

D. As; that

解析：考查名词性从句。第一空是主语从句，缺少主语，所以用what，第二空是表语从句，由that引导，所以选B。