目前，社区宽带网中基于电信网络的技术是【 】。
参考答案：数字用户线路xDSL方式
解析：目前，社区宽带网中基于电信网络的技术是数字用户线路xDSL方式。
All I have learned about the exam____ that three students faileD.
A. is B. are C. will be D. have been
