We have been long back at school three weeks now怎么译

We have been long back at school three weeks now怎么译 we ( )(now have) lunch at school. i am staying at this hotel for three weeks , i have been sta We have been good friends since we met at school. We have three h____ lessons a week at school . We （have been） good friends since we met at school.为什么用have we have been together for such long time...now music and me ( )will he be back?In three weeks A.How often B.How long C.H they have been in nanjing since ______.A.three weeks B.three The twins___Canada for three weeks.A.has been to B.have been I’ve been here for three weeks now,and _____ I’ve enjoyed my He should have been at boarding school