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12.Without facts we can't form a correct opinion,for we need to have actual knowledge         our thinking.(  )
A.which to be based onB.on which to base
C.which to base onD.on which to be based

分析 没有事实我们无法形成正确的观点,因为我们需要实际知识作为我们思考的基础.

解答 答案是B.本题考查非谓语动词;当定语从句的主语和主句的主语一致时,可以省略从句中的部分内容.本题中定语从句完整的表达为"we are to base our thinking on actual knowledge",将先行词用关系词which 代替,介词提前,省略从句中与主句相同的主语和be动词,故答案是B.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.要关注常见非谓语动词的搭配.

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