— I can't find my dictionary anywhere. 

— You _____ have lost it while studying in the library. [ ]

A. can

B. may

C. would

D. should

在项目投资决策的参与主体中，投资者最关注的是( )。

A．项目的收益水平和风险高低

B．自身的安全性

C．资金的流动性和收益性

D．充分就业、物价稳定、国际收支平衡