They have never been to Bei Jing 怎么改反意疑问句?

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They have never been to Bei Jing 怎么改反意疑问句?

Have they ever been to Beijing?

They have never been to Bei Jing ,have they?never含有隐形否定

have they?

How ever they have been to Beijing?

have they?

They have never been to Beijing,haven't they?