It _____ Sunday, I didn’t need to go to work.I tidied all the cupboards of my apartments.

A．being

B．is

C．to be

D．been

国内负压原油稳定装置螺杆式压缩机在停机前应该（），运行2~3min，按主机停机开关。

A.打开出口管线的卸载阀

B.关闭入口阀

C.将出口阀全开

D.关闭回流阀