题目内容
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。
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