【題目】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：這是歷史上一個重要的事件。誰知道是什么時候發(fā)生的？本題考查賓語從句。賓語從句需遵循“陳述語序”原則，因此排除選項A和選項C。根據(jù)題干中“in history”確定是一般過去時。選項B為一般現(xiàn)在時；選項D為一般過去時。故正確答案為選項D。

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