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

题目

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.

答案

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.