At a construction site in our city the workers have uncovered an ancient wall that_______ to keep the enemy out of the city, but it requires further evidence.

A．might have functioned

B．would have functioned

C．must have functioned

D．should have functioned

财务评价应遵循的基本原则是( )。

A．动态与静态分析相结合，以静态分析为主的原则

B．基础数据确定的稳妥原则

C．费用与效益计算范围一致性原则

D．动态与静态分析相结合，以动态分析为主的原则

E．费用与效益识别的有无对比原则