There       a school here, but now it’s a big mall here.

A．used to have

B．used to having

C．used to be

D．used to being

水泵停止时倒转，应该（）。

A.重新启动；

B.检修水泵；

C.严密关闭泵出口门；

D.严密关闭泵入口门。