---It’s 12 April today. Have they            found any useful information about the plane's black box?

---Flight MH370? Yes, but it’s difficult to decide where the black box really is.

A．still

B．ever

C．yet

D．never

( )的项目管理工作主要在项目实施阶段和投产竣工阶段进行。

A．业主方

B．设计方

C．施工方

D．供货方