I usually sleep with the window open it’s very cold.A．untilB．unlessC．whenD．if 题目和参考答案——青夏教育精英家教网——

题目内容

I usually sleep with the window open _____ it’s very cold.

A．until

B．unless

C．when

D．if

B

本题的含义是如果天不冷的话，我通常把窗子开着睡觉，unless表示如果不的意思，与题意相符，故本题选B。

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