They have never seen the man before,haven't they?A:have B:never C:seen D:haven't哪一个是错误的,并改正还有理由哈!

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They have never seen the man before,haven't they?
A:have B:never C:seen D:haven't
哪一个是错误的,并改正
还有理由哈!

D.前面never已经是否定了,所以后面应该用肯定have they