◎ 题干
He has made another wonderful discovery, _____ I think is of great importance to science.  
[     ]
A. which      
B. what      
C. when    
D. that
◎ 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“He has made another wonderful discovery, _____ I think is of great importance to science.[ ]A. whichB. whatC. whenD. that…”主要考查了你对  【关系代词】【非限制性定语从句】  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。