how long do you think they__the TV factory?a.have been to b.

how long do you think they__the TV factory?a.have been to b. How long have you been to ShangHai?For a year. How long have you been to department How long have you been a teacher How do you ____ the TV (A.think of B.like C.think D.think ab DO you think Mary have a TV _______ TV do you watch every day a.how much b.how long 为什么? how long have you___beijing?A gone to B been to C been in D ( )have you been a great volunteer?A.How ohten B.How long C. "How long have you been how long( )you( )a doctor?Three years A ,have:been B,have:be A:What did you do last night?B:I ___ (watch) Tv.A:How long _