You often swim,___?A:don't you B:do you 选哪个,为什么
问题描述：
You often swim,___?A:don't you B:do you 选哪个,为什么
答
选A
这是反义疑问句,you often swim, don't you？ 你经常游泳，不是么？
you don't often swim, do you?
反义疑问句就是 前反后肯定，前肯后否定
答
这是考查反义疑问句的题目,前面的句子是肯定的,反义疑问句要用否定的,所以应该选择B.