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    【题目】Without facts, we can't form a worthwhile opinion, for we need to have factual knowledge ______ our thinking.

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

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

    【答案】B

    【解析】base. . . upon/on “以……为基础”。句意：没有事实，我们就不能形成有价值的观点，因为我们的思考要建立在客现事实的基础上。这里的结构是base our thinking on/upon factual knowledge。

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