I am sorry to have you ________ so long. A．waited B．to wait

I'm sorry to keep you___ so long.A.wait B.so wait C.waiting 英语改错 “I'm sorry to have kept you to wait for so long” Have a look you pass by I waited so long to say go to bed? I'm sorry.I have kept you ()for me so long.A:wait B:waiting i am sorry to（）you so much trouble A have given B have been I am sorry to keep you _______(wait)for me for a long time. .I'm sorry to keep you ___ for a long time.A.to wait B.waiti i am sorry to keep you waiting so long I am t() sorry I have let you wait long I am sorry ________(keep) you _____(wait) for a long time. I am sorry to have kept you waiting so long.这句为什么用to have ke I'm sorry to have kept you waiting so long.