Do you have any idea when the project will be carried out?

—No, but I have heard that it was not until last month _______ it was approved.

A．that

B．when

C．since

D．before

在PDSN发送给AAA的计费包中，（）属性可以标识PPP拆线的原因。

A.IP-Technology

B.Release-Ind

C.Service-Option

D.Service-Reference-ID