To keep the air fresh during the night, I often sleep with the windows on it’s really cold.A. unless B. if C. because D. when 题目和参考答案——青夏教育精英家教网—

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To keep the air fresh during the night, I often sleep with the windows on ________ it’s really cold.

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

【解析】

试题分析：句意:为了夜里睡觉空气新鲜，我经常开着窗子睡觉，除非天气很冷。unless除非……否则……，引导条件状语从句，符合语境；if如果；because因为；when当……时候。三者都不合语境，故选A

考点：考查连词。

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