单选题：Without facts, we cannot form a worthwhile opinion for we ne

题目分类：公共英语四级
题目类型：单选题
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题目内容：

Without facts, we cannot form a worthwhile opinion for we need to have factual knowledge（　　）our thinking. A．which to be based on
B．which to base upon
C．upon which to base
D．to which to be based

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分类：公共英语四级题型：单选题

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分类：公共英语四级题型：单选题

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分类：公共英语四级题型：单选题

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