How long have you been there?

How long have you been away there这句话对吗 "How long have you been how long did you stay there/have you been stay there有什么区别? How long have you been skating? how long have you been playing basketball ? How long have you been swimming? How long have you been ____? 1.How long have you been here? how long have you been ---work? “How long have you been watching how long have you been 用法 How long have you been in China?