how long have you done与how long have you been的区别
how long have you done与how long have you been的区别
How long have you been skating?与How long did you skate?的区别
how long have you been in与how long have been to的区别,还有how lon
"How long have you been
How long have you been for china与How long have you been in c
how long have you done that
How long have you been collecting shells?与How long have you
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?