.

---How did you know the surprising news?

---I happened _______ the event then.

A．to be covered

B．to have covered

C．to be covering

D．to cover

将项目设想转变为概略的投资建议的项目投资机会研究是( )。

A．分析投资动机

B．鉴别投资机会

C．确定投资目标

D．具体项目论证