是haven't you
因为you' ve got =you have got ,前有助动词HAVE老师说做反义疑问句时，先变成否定句：You haven't got a bule pencil.所以是You have got a bule pencil ,haven't you? 但是这句句子的否定句也可以是：You don't have got a bule pencil .那么:You have got a blue pencil, don't you 也可以么？？？不可以，因为的否定句是Youhaven'tgot a bule pencil.故它的反意疑问句是You haven'tgot a bule pencil, have you ?