Without facts, we cannot form a worthwhile opinion, for we need to have factual knowledge ________our thinking.

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问题 Without facts, we cannot form a worthwhile opinion, for we need to have factual knowledge ________our thinking.

选项 A、upon which to base
B、which to base upon
C、which to be based on
D、to base on which

答案A

解析 本题考查定语从句。分析句子结构可知,空格处及其之后的部分是定语,修饰先行词factual knowledge,将句子内容补充完整即to base our thinking on/upon factual knowledge。根据选项判断,“介词+关系代词+不定式”的结构是简化的定语从句。因此空格处应填入on/upon、which to base,故答案为A项。
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