Serving-GW（以下简称SGW）终结和E-UTRAN的接口，主要负责（）等功能，支持3GPP不同接入技术的切换，发生切换时作为用户面的锚点

A、用户面处理

B、数据包的路由

C、数据包的转发

D、SAE承载控制

The conflict between Gadhafi’s government army and the rebels in Libya made ______ difficult for the foreigners to leave the country.

A．so

B．much

C．that

D．it