[题目]I enjoy fresh air so always sleep with the window open it is really cold．A．unless B．when C．if D．Since 题目和参考答案——青夏教育精英家教网—

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【题目】I enjoy fresh air so always sleep with the window open ______ it is really cold．

A．unless B．when C．if D．Since

【答案】A

【解析】

试题分析：A．Unless除非，如果不；B．When当……的时候；C．If如果；D．Since自从。句意：“我喜欢新鲜空气，因此我总是让窗户开着，除非真的很冷。”故unless“除非”符合题意。根据题意可知选A。

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