---Did you watch the basketball match yesterday?

---Yes, I did. You know, my brother_______ in the match.

A．is playing

B．was playing

C．has played

D．had played

下关于综合布线系统设计等级的描述中，哪个是错误的______

A) 综合布线系统类型分为基本型、增强型和综合型
B) 基本型采用光缆组网
C) 综合型采用光缆和铜芯双绞电缆混合组网
D) 增强型采用夹接式或插接交换硬件