I am sorry to have kept you waiting so long.这句为什么用to have kept 而不是to keep 与时态有关系吗

I am sorry I have to I am sorry to have kert you_______(wait)so long. I am sorry to have missed you的意思 I am so sorry that l have to leave.是什么意思 I am sorry ____you waiting.to keepkeepingto have kept I am sorry,but we have to depart. I am sorry to hear that.与I am sorry to have heard that.的区别是什么? I am sorry to myself I am sorry.I have no time to() to you空前面是W开头 I am sorry I have no c() to go to college I am sorry,------.I have to go to the doctor ------.填词 I am sorry to hear that.我觉得应该说成：I am sorry to have heard that.因为是先听到that再感到sorry不是吗? sorry!I have try my best to forget you.At last,i found i am failed. I am sorry to say you___ wait(选择）She isn't there.I am sorry to say you___ wait1.must 2.should3.have to4.will have to 英语翻译I am 『Sorry.』I ｛love} you ,But have 《Nothing》 to do with you. I have understood how important I am in your heart…Sorry to hurt you. I am sorry for what I have said to you怎么翻译 i am sorry to inform you that i have no choice ____to refuse your applicatio