【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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