I am sorry ,I am late,did you have been waiting for a long t
I am sorry you have been waiting so long .BUT
I am sorry to have kept you waiting for a long time.
I am t__ sorry I have kept you waiting long.
I am sorry you have been waiting so long .but it will still
I am very sorry for keeping you waiting so long.
I am sorry for keeping you waiting for a long time为什么用keepin
I am sorry to keep you waiting for me for a long time
I am t() sorry I have let you wait long
I am waiting for you.和I have been waiting for you.的区别
I am sorry I _____(keep)you waiting so long.
--i am sorry to have kept you waiting long ---never mind .i
i am sorry to keep you waiting so long