单项选择题

In hot summer days we usually sleep with the windows ______

A. open
B. opened
C. close
D. closing
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( ) 温室效应 ( ) 酸雨
单项选择题
A. No, it doesn’t matter. B. I don’t think so. C. I’ve got a sore throat. D. It matters a lot.
A. No, it doesn’t matter. B. I don’t think so.
C. I’ve got a sore throat. D. It matters a lot.
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