-Kate,I haven't seen your mother for a long time.-she____Tianjin on business for three weeks.a.has gone to b.has been in

-Kate,I haven't seen your mother for a long time.-she____Tianjin on business for three weeks.a.has gone to b.has been in
-Kate,I haven't seen your mother for a long time.-she____Tianjin on business for three weeks.
a.has gone to b.has been in

-Kate,I haven't seen your mother for a long time.-she____Tianjin on business for three weeks.a.has gone to b.has been in
B 如果后面没有时间的话,就是选A,代表去天津出差.但是这句话后面加了时间限制,代表她要在那儿呆3个星期