_________ many times, but he still couldn’t understand it.

A．Having been told

B．Though he had been told

C．He was told

D．Having told

随着EVDO网路应用的不断扩展，原来仅为满足高速无线数据业务需求的初衷也发生了巨大变更，EVDOA发展的目标是（）

A.提高反向链路吞吐量

B.提高前向链路利用率

C.增强对于QOS的支持

D.完善1X/DO的双模操作