I usually sleep with the window open ________ it is really cold.A．ifB．unlessC．no_刷题宝

题干

I usually sleep with the window open ________ it is really cold.

A．if

B．unless

C．now that

D．in case

上一题下一题 0.64难度单项选择更新时间:2017-02-28 09:18:33

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