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    精英家教网 > 高中英语 > 题目详情
    When and where this took place _____ still unknown.
    A．isB．hasC．wereD．are
    A

    试题分析：考查主谓一致：句意：这在什么时候什么地方发生的还不知道。主语是单个的主语从句的时候谓语用单数，unknown是形容词，前面用be动词，选A。
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