I usually sleep with the window open it is really cold.A. ifB. unlessC. now that D. in case

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【题目】I usually sleep with the window open ________ it is really cold.

A. ifB. unlessC. now that D. in case

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【答案】B

【解析】

试题分析：考查连词辨析。A. if如果；B. unless除非；C. now that既然；D. in case万一。句意：我通常开着窗户睡觉，除非天气真的很冷。故选B。