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【題目】— Are you sure you have to do this now? It's been very late.
— I don't knowto do it if not now.
A.where
B.how
C.what
D.when

【答案】D
【解析】句意; －你確信你現(xiàn)在必須做嗎？很晚了。－如果現(xiàn)在不做, 我不知道何時做。A.where在哪兒, 指地點; B.how怎樣, 指方式; C.what什么, 指事物; D.when何時, 指時間。由now可知本空指時間。故選D。

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