◎ 题干
Our teacher set us such a difficult math problem ____ we could not work out.    
[     ]
A. that    
B. which    
C. as    
D. even
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Our teacher set us such a difficult math problem ____ we could not work out. [ ]A. that B. whichC. as D. even…”主要考查了你对  【关系代词】【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。