【題目】【2012山東德州】I enjoy fresh air so I always sleep with the window open _____ it is really cold.

A. unless B. when C. if D. since

【答案】A

【解析】

試題分析：.unless 意為“如果不……”；when 意為“當(dāng)……時候”；if 表示“如果”；since 則意為“自從……以來”。根據(jù)句意“我喜歡新鮮空氣因此如果不是很冷，我總是開著窗戶睡覺”可知用unless引導(dǎo)。

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