He went back to the hall to try his__________at finding his lost gold watch,but never found it. [ ]

A. fortune  

B. best

C. result 

D. hard

在编制工程项目管理规划大纲时，进度计划应采用（）形式。

A．横道图

B．单代号网络图

C．双代号网络图

D．双代号时椽两终图