-How come your father can read books in German?

-Well, he _______ on a project with some German engineers for 3      years when he was young.   [ ]

A. worked               

B. has worked        

C. had worked      

D. would work

项目管理信息系统中成本控制的功能不包括（）。

A．计划施工成本

B．计算实际成本

C．投标估算的数据计算和分析

D．编制资源需要量计划