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

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

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

A


解析:

全句意思为:没有事实,我们就不能形成有价值的观点,因为我们的思考必须以真实的知识为基础。故选A。upon which to base our thinking是动词不定式短语作定语,该短语中介词必须放在which前。参见必背句型2。

答案:A

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