—Tom, it’s time that you _______your own clothes.

—I would rather you _______that for me just like before.

A．washed; had done

B．wash; have done

C．washed; have done

D．wash; had washed

以下说法中哪一个是错误的

A．环型拓扑构型中，节点通过相应网卡，使用点—点连接线路，构成闭合的环型

B．环中数据沿着两个方向绕环逐站传输

C．为了确定环中每个节点在什么时候可以插入传送数据帧，同样要进行控制

D．在环形拓扑中，多个节点共享一条环通路