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【题目】I enjoy fresh air so I always let the window open ________ it is really cold.

Aunless Bwhen Cif Dsince

【答案】A.

【解析】句意:我喜欢新鲜空气,因此我总是让窗户开着,除非真的很冷。天冷让窗户开着的否定条件,故unless除非符合题意。

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