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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:初中英语 来源:河南省模拟题 题型:单选题

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:初中英语 来源: 题型:

 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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