Does she have curly hair or straight hair?

问题描述:

Does she have curly hair or straight hair?
这里为什么have而不是has?

因为是疑问句.前面有助动词does了.
原句肯定形式是:She has curly hair/straight hair.
否定,疑问句,有助动词,do的时候,动词,不再用三单.