宽带IP城域网是一个以IP和SDH、ATM等技术为基础，（）、语音、视频服务为一体的高带宽、多功能、多业务接入的城域多媒体通信网络。
参考答案：集数据
—I regret _____ you that Mary was badly injured in the accident.
—I can hardly believe my eyes. She is always so careful.
A．informing
B．having informed
C．to inform
D．to have informed
汽车发动机用曲轴
