We had so much homework. I didn’t go to bed         I finished it yesterday evening.

A．after

B．until

C．when

D．but

数控机床具有自诊断功能，并可将诊断到的故障或错误以报警号或将（）的形式显示在屏幕上。

A.错误内容

B.故障原因

C.故障排除方法

D.错误代码