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    【题目】It’s an important event in history. Who knows _________?

    A. when does it happenB. when it happens

    C. when did it happenD. when it happened

    【答案】D

    【解析】

    句意：这是历史上一个重要的事件。谁知道是什么时候发生的？本题考查宾语从句。宾语从句需遵循“陈述语序”原则，因此排除选项A和选项C。根据题干中“in history”确定是一般过去时。选项B为一般现在时；选项D为一般过去时。故正确答案为选项D。

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