Facing the economic depression, every possible means ______ this year to save the company

from going bankrupt.[ ]

A. has been tried

B. has tried        

C. have been tried    

D. have tried

目前，我国的证券投资基金主要是（）。

A．公司型基金

B．契约型基金

C．单位信托基金

D．对冲基金