Question

      is known to us all is     the 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

Answer 1

B

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。