题目内容
_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties. A．It; whom B．As; whose C．As; whom D．It; whose
A
试题分析：句意：众所周知，这位年老的科学家，过去他的生活很艰难，在他八十多岁时仍然努力工作。
It is known to us all that是个固定句型，意思是众所周知。这个句子包含一个介词+关系代词引导的定语从句，指人，只能用whom，选A。
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