—It’s a long time since I saw my sister.

—__________ her this weekend?

A．Why not visit

B．Why not to visit

C．Why not visiting

D．Why don’t visit

生产准备贯穿在实施准备阶段、实施阶段和投产竣工阶段，主要工作在( )阶段完成。

A．决策

B．实施准备

C．实施

D．投产竣工