Question

____is known to us all is that the old worker, ____life was hard in the past, still works hard in his seventies.

A．As, whom

B．What, whom

C．It, whose

D．What, whose

Answer 1

D
试题分析：考查主语从句和非限制性定语从句，第一空是what引导的主语从句，在主语从句中what做的是主语，第二空是非限制性定语从句，先行词是the old worker，定语从句中缺少定语，用whose引导定语从句，句意：众所周知的是那个过去生活很艰难的老工人70岁了还很辛苦工作。选D。
点评：主语从句的连接词主要看的是从句所缺的成份，缺少主宾表的用what，不缺成分的用that，非限制性定语从句主要看先行词和定语从句中所缺的成分判断，这题定语从句缺少的定语用whose引导定语从句。