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【題目】 You used to be careful,________?

A. did you B. didn’t you

C. do you D. don’t you

【答案】B

【解析】

試題分析:句意:你過去很認真,不是嗎?本句是反義疑問句,遵循的結構:前肯,后否;前否,后肯。 used to過去常常,問句需借助于助動詞did。所以選B。

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