I am sorry you have been waiting so long .but it will still

I am sorry you have been waiting so long .but it will still I am sorry you have been waiting so long .BUT I`m sorry you`ve been waiting so long,but it`ll still be som I am sorry I _____(keep)you waiting so long. I am very sorry for keeping you waiting so long. i am sorry to keep you waiting so long I am t__ sorry I have kept you waiting long. I'm sorry to have kept you waiting so long. before和till的区别 例 i'm sorry you've been waiting so long,but i I am sorry to have kept you waiting so long.这句为什么用to have ke I am sorry that you ___for such a long time,our but it will I'm sorry to have kept you waiting so long 和i' m sorry to ke