项目进度管理规划中，进度计划应采用( )的形式，并注明主要的里程碑事件。

A．横道图

B．S形曲线

C．香蕉曲线

D．列表

——Did you know any French before you arrived in Washington?

——Never ____ it, actually.

A．had I learned

B．have I learned

C．I have learned

D．I had learned