He can hardly believe the fact that he has failed in the exam.(完成反意疑问句)

问题描述:

He can hardly believe the fact that he has failed in the exam.(完成反意疑问句)
He can hardly believe the fact that he has failed in the exam,______ ______?

He can hardly believe the fact that he has failed in the exam,can he?
句中含否定的副词hardly、never、seldom等,附加问句的特殊动词用肯定式.