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【题目】 You used to be careful,________?

A. did you B. didn’t you

C. do you D. don’t you

【答案】B

【解析】

试题分析:句意:你过去很认真,不是吗?本句是反义疑问句,遵循的结构:前肯,后否;前否,后肯。 used to过去常常,问句需借助于助动词did。所以选B。

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