◎ 题干
Without facts, we can't form a worthwhile opinion for we need to have factual knowledge _____ our thinking.

[     ]

A. upon which to base       
B. which to be based on
C. which to base on       
D. to which to be based on
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Without facts, we can't form a worthwhile opinion for we need to have factual knowledge _____ our thinking. [ ]A. upon which to base B. which to be based on …”主要考查了你对  【关系代词】【介词和介词短语】【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。