Large quantities of information＿＿＿since then as to how the program has worked.

A．has been offered

B．were offered

C．have been offered

D．was offered

关于明确估价目的的说法，正确的是()。

A．估价目的由价值类型决定

B．估价目的根据估价师的经验确定

C．估价目的由委托人的估价需要决定

D．估价目的根据估价对象和价值时点综合确定