____excited us greatly was that the Chinese team defeated their Egyptian team on Friday evening with 3-0.

A．What

B．That

C．It

D．Which

用( )定义虚拟局域网的缺点是：要求用户最初必须配置到至少一个虚拟网络中。

A．交换机端口号

B．MAC地址

C．网络层地址

D．IP广播组