How long have you been here?
How long have you been stay here?
How long have you been living here?
都可以啊,最口语化的是How long have you been here? 后面两个都是书面语啊.
How long have you been here?
How long have you been stay here?
How long have you been living here?
都可以啊,最口语化的是How long have you been here? 后面两个都是书面语啊.