—Did you see who the driver was?

— No, so quickly _____ that I couldn’t get a good look at his face.

A．does the car speed by

B．did the car speed by

C．the car sped by

D．the car speeds by

蒸汽管道在向上登高转弯时，应安装（）装置。

A、排气

B、放空

C、疏水

D、连通