第1个回答 2011-11-24
You wait long ,I am so sorry for that!
第2个回答 2011-11-23
I'm sorry to have kept you waiting .
I'm sorry that you 've had to wait .
I'm sorry to keep you waiting for long.
第3个回答 2011-11-23
I'm sorry to keep you waiting for long
第4个回答 2011-11-23
I‘m sorry for keeping you waiting so long
第5个回答 2011-11-23
I am sorry to have kept you waiting