I enjoy fresh air so I always sleep with the window open            it is really cold.

A.unless
B.when
C.if
D.since
A
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科目：初中英語(yǔ) 來(lái)源：河南省模擬題 題型：單選題

I enjoy fresh air so I always sleep with the window open            it is really cold.
[     ]
A.unless
B.when
C.if
D.since

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科目：初中英語(yǔ) 來(lái)源： 題型：

 I enjoy fresh air so I always sleep with the window open           it is really cold.

A. unless     B. when                C. if                    D. since

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