I'm _______(ture) sorry that I've kept you waiting so long

I'm _______(ture) sorry that I've kept you waiting so long I'm sorry to have kept you waiting so long. I'm sorry to have kept you waiting so long 和i' m sorry to ke i'm t__ sorry i've kept you waiting long.怎么填空格 I'm sorry.I have kept you ()for me so long.A:wait B:waiting 单选题 ---I’m sorry to have kept you waiting so long.--- 1.Don’ I'm sorry I have kept you ______ so long. I`m sorry you`ve been waiting so long,but it`ll still be som I am t__ sorry I have kept you waiting long. I'm sorry to keep you waiting so long before和till的区别 例 i'm sorry you've been waiting so long,but i Sorry to have kept you waiting so long.I didn't know you__he