问题
选择题
________ is know 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
答案
答案：D
第一空填What，是由What 引导的名词性从句作主语。第二个空是定语从句，whom
指前面的先行词the old worker。故答案选D。