Which of the following sentences is INCORRECT？A．I suppose he ought to have known that, don

Which of the following sentences is INCORRECT？

A．I suppose he ought to have known that, don"t I？

B．He seldom gives his wife a gift, does he？

C．There won"t be any trouble, will there？

D．No one would object, would they？

请帮忙给出正确答案和分析，谢谢！