The old man was so angry and spoke so fast that none of his children understood ____ he said meant.

A．that, that

B．what. what

C．what

D．that

增值网业务是指在（）上开放的业务，可以向用户提供基本业务外的信息或重组信息业务。

A、智能网

B、增值网

C、通信网

D、电话网