题目内容：

I don't think you've heard of him before,____?A.have you B.do I C.haven't you D.don't I

优质解答

a 像这种带有个人猜测（i think i guess等）直接跳过 think guess 等,看从句.
从句中 have +前面的 not（否定转移到后面从句中）=have not
所以反义疑问要用 （have not） 的反义 have 即 have you（用从句中的主语）