— Why didn’t you leave school? It’s already eight o’clock.

— Because I            my homework yet.

A．wasn’t finishing

B．wouldn’t finish

C．haven’t finished

D．wasn’t finished

下列选项中，都属于微型计算机输出设备的是( )

A．音响设备、扫描仪
B．显示器、绘图仪
C．打印机、光笔
D．卡片阅读机、鼠标