These volunteers have little nursing experience,have they?还是do they?

问题描述:

These volunteers have little nursing experience,have they?还是do they?
书本是说have they 可是我怎么也觉得是错的,有没有一个正确的解释是肯定用have they呢?我觉得是用do they.

在此处have 是实意动词,所以反义疑问句的部分应该用do they?
They have learnt English for three years,haven't they?
We haven't got any help,have we?在后面的这两个句子中have都是助动词.