i`m sorry to keep you_____.you know,i`ve_____for about two h

i`m sorry to keep you_____.you know,i`ve_____for about two h I'm sorry to keep you waiting. I'm t______ sorry to keep you waiting for two hours. I'm sorry to keep you waiting so long -i'm sorry to keep you waiting -______ I am sorry to keep you_____ A.to wait B.waiting C.waiting fo I'm sorry to keep.为什么keep前面加to I hate to not participate in your past I'm sorry to keep you I’m sorry I know little about French. I'm sorry,did you help me ask about my bonus?Two days later, I'm sorry,dear,I now see that you talk about,you asked me to i'm sorry()so long,i forgot to tell you in advance where i h