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    【题目】 When and where this took place _____ still unknown.

    A. is B. has

    C. were D. are

    【答案】A

    【解析】

    试题分析：考查系动词。句意：这个发生在何时何地还不清楚。主语从句作主语，谓语动词用单数形式，故选A。

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