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    精英家教网 > 高中英语 > 题目详情

    【题目】We don’t know they did it.

    A. which B. who C. what D. how

    【答案】D

    【解析】

    考查名词从句的引导词。我们不知道他们是怎么做到的。

    分析从句可知，从句中有主谓宾。所以只缺状语，而A、B、C三项都是代词，不能作状语，只有D项是副词，可以作状语，故选D项。

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