is known to us all is that the old worker, for life was hard in the past, still works hard in his seventies.
A. As; whom
B. What; whose
C. It; whose
D. What; whom
网友回答
A. As; whom
B. What; whose
C. It; whose
(答案→)D. What; whom
解析：句意：我们都知道的是对他来说过去的生活很难的那个老工人70几岁了还在辛苦的工作。What引导一个主语从句，并作从句的主语。第二个空代替先行词the old worker，并作介词for的宾语，用whom。如果填whose，定语从句就没有主语了。选D。