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【题目】—Are you sure you have to do this now? It's been very late.

—I don't know to do it if not now.

A.whereB.howC.whatD.when

【答案】D

【解析】

句意:你确信你现在必须做吗?很晚了。如果现在不做,我不知道何时做。

考查疑问词辨析。这里是疑问词+to doA.where在哪儿,指地点;B.how怎样,指方式;C.what什么,指事物;D.when何时,指时间。由now可知本空指时间。故选D

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