◎ 题干
________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 ; whom    
C. As; whose                                  
D. What; whom
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“________is known to us all that the old scientist, for ____________life was hard in the past, still works hard in his eighties.[ ]A. It ; whomB. As ; whom C…”主要考查了你对  【关系代词】【非限制性定语从句】【it的用法】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。