I usually sleep with the window open _____ it’s very cold.A．untilB．unlessC．whenD
题型：不详难度：来源：
I usually sleep with the window open _____ it’s very cold.| A．until | B．unless | C．when | D．if |
|
答案
| B |
解析
| 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。 |
举一反三
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