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

A．untilB．if
C．thatD．unless

D

解析試題分析：句意：我總是開著窗戶睡覺(jué)除非外面很冷。until  直到；if   如果； that那；unless除非。根據(jù)前后句子句意可知該選D。
考點(diǎn)：考查連詞。

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