2. 外语
  3. Without facts, we cannot form a correct opinion for we need to have factual knowledge______our thinking.

Without facts, we cannot form a correct opinion for we need to have factual knowledge______our thinking.

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问题 Without facts, we cannot form a correct opinion for we need to have factual knowledge______our thinking.
选项 A、upon which to base
B、which to base
C、which to be based on
D、to which to be based
答案A
解析 定语从句题。根据四个选项可知，本题考查“介词+关系代词+不定式”作后置定语，在这种情况下不定式不用被动。此句需要后置定语来修饰factual knowledge，根据句意应是base our thinking on(或upon)factual knowledge。base是不及物动词，介词on或upon不能省略，因此选择A。
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