how long have u been keeping doing that / how long have u kept doing that.这持续多久了,那个对?

How long have you been hehe ,what have been doing for all day long Y how are u how long have u been keeping doing that / how long have u kept doing that.这持续多久了,那个对? how long have you been learning english? How long have you been studying? How long have you been in China? how long have you been dancing today? How long have you been there? “How long have you been watching How have u been up to I have been waiting regardless of how long do I have been waiting long是什么 How long have you been here?为什么是How long have you been here,不是How long have you been standing here? how long have you been in与how long have been to的区别,还有how long have been与前两者的区别. how long have you done与how long have you been的区别 How long have you been collecting shells?翻译 英语：how long have you been collecting shells?主要语法 翻 译 How long have you been like this? HOW long have you been studying english 怎么回答