For how long have you been using Skype?
For how long have you been using Skype?
How long have you been for china与How long have you been in c
"How long have you been
How long have you been to ShangHai?For a year.
For how long have you been away from home
How long have you been looking for a job?
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?