◎ 题干
—It seems that you are really suffering from a bad cold. How long have you been like this?
—Since last week. When the weather turned cold, I ________ more clothes.
[     ]
A. haven't put on  
B. don't put on
C. hadn't put on  
D. didn't put on
◎ 答案
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◎ 解析
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◎ 知识点
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