I am sorry ____you waiting.

I am sorry ____you waiting. I am sorry I _____(keep)you waiting so long. I am t__ sorry I have kept you waiting long. I am sorry you have been waiting so long .BUT I am very sorry for keeping you waiting so long. i am sorry to have kept you waiting. i am sorry to keep you waiting so long I am sorry to keep you_____ A.to wait B.waiting C.waiting fo i am sorry to keep you waiting keep you waiting 后面能接动名词吗 1 I am sorry 是不是主系表结构 I am sorry to keep you waiting.句子中的to I'm sorry ____you up yesterday. I am sorry to keep you waiting for so longA I don't think so