EAMIL is very popular today ,people seldom write letters now,答案~~A`did they b`didn"t they c do they d` don"t they >>>> 答案为什么要选B

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EAMIL is very popular today ,people seldom write letters now,答案~~A`did they b`didn"t they c do they d` don"t they >>>> 答案为什么要选B

不是应该选D吗?