I' m sorry to keep you waitting for a long time.这句话为什么用wait的

I' m sorry to keep you waitting for a long time.这句话为什么用wait的 .I'm sorry to keep you ___ for a long time.A.to wait B.waiti 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 keep you_______(wait) for em for a long time. I am sorry to keep you _______(wait)for me for a long time. I'm sorry to keep you （）for a long time. 用所给词的正确形式填空:1.I’m sorry I kept you( )(wait)for a long time . I am sorry ________(keep) you _____(wait) for a long time. I'm sorry I ___(keep) you waiting for such a long time I am sorry to keep you waiting for me for a long time sorry to keep you waiting for such a long time .I must say s