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【题目】Without facts, we can’t form a correct opinion, for we need to have actual knowledge ________ our thinking.

A. which to be based on B. on which to base

C. which to base on D. on which to be based

【答案】B

【解析】考查定语从句。句意:没有事实作为依据我们无法形成正确的观点因为我们需要依据事实来思考问题。用不定式作定语修饰前面的名词,构成have sth to do,不定式用主动表被动,故A/D不错误的。如果用“疑问词+不定式”作定语,那么不定式中的介词要放在疑问词之前。该句也可写成:...for we need actual knowledge to base our thinking on,故选B。

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