.I sleep with the window open _____it's really cold.

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.I sleep with the window open _____it's really cold.
A.though B.unless 选什么.原因.翻译都通.

选B
因为A though 尽管,表示情况或事情的转折
但是根据语境,并无转折的意思：如果填入A,就成了
我睡觉一般是开着窗的,__尽管_外面确实很冷.
显然前后并无很强的转折关系（所谓转折是指前后说的是同一件事情或对象,而这里前半句说的“我”睡觉的习惯,后半说的是天气和环境）,不符合语境,故A不能选.
所以要选B,Unless 除非
根据上下文,前半句用的一般现在时,所以表示是一种平时一贯的习惯或做事方式
而后半句的内容说明了一种意外情况,故要填Unless

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