My family consider ＿＿ a computer, which is considered ＿＿ a great help in our work.

A．buying; to be

B．buying; being

C．to buy; being

D．to buy; to be

完全预期理论( )。

A．只承认对未来短期利率的预期可能影响远期利率
B．还承认存在其他因素影响远期利率
C．只承认市场流动性影响远期利率
D．市场流动性可以系统地影响远期利率