2. 外语
  3. We cannot form a sound opinion without facts, for we need to have factual knowledge______our thinking.

We cannot form a sound opinion without facts, for we need to have factual knowledge______our thinking.

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问题 We cannot form a sound opinion without facts, for we need to have factual knowledge______our thinking.
选项 A、which to base upon
B、upon which to base
C、which to be based upon
D、to base upon which
答案B
解析 非谓语动词题。由“介词+关系代词+不定式”构成的不定式短语可以用作后置定语，相当于定语从句。在正式文体中，当引导定语从句的关系代词用作介词的宾语时，有时可用“介词+关系代词+不定式”这样的结构来简化定语从句，该结构中的介词不能省略，并且该介词不能位于不定式的后面；但如果该结构语义清楚，且结构恰当，有时可省略其中的关系代词，而只保留介词和不定式，此时介词要移至不定式之后。原句中不定式正常的语序应是to base our thinking upon factual knowledge，其中用关系代词which指代了先行词factual knowledge，和介词upon一起被提到不定式之前，故选项[B]为答案。
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