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I always sleep with windows open _______ it is too cold outside.

A.untilB.if
C.thatD.unless

D

解析试题分析:句意:我总是开着窗户睡觉除非外面很冷。until  直到;if   如果; that那;unless除非。根据前后句子句意可知该选D。
考点:考查连词。

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