英语单选---I'm sorry,john.I ____ your radio for such a long time

I'm sorry I ___(keep) you waiting for such a long time I'm exhausted after working for such a long time ____.let's sorry to keep you waiting for such a long time .I must say s I'm sorry I-------------(keep)you waiting for such a long ti I'm sorry to keep you_______(wait) for em for a long time. .I'm sorry to keep you ___ for a long time.A.to wait B.waiti I’m awfully sorry to have kept you waiting for a long time. I'm sorry to keep you （）for a long time. i'm sorry to have kept you writing for a long time I’m sorry to keep you _(wait) for a long time 适当形式 i'm sorry to keep you ----（wait） for a long time i'm sorry to have kept you waiting for a long time