---Sorry for being late again.

---__________here on time next time, or you’ll be punished.

A．Be

B．Being

C．To be

D．Been

离心泵长时间在关闭出口阀的条件下运转将造成不利影响，下列说法正确的是（）

A、密封泄漏

B、电流超高

C、泵汽蚀

D、泵出口压力低