--Oh,Tom! You are too late.

---Sorry. How I wish I_____measures Mr Smith suggested to leave ten minutes earlier.

A．adopted

B．would adopt

C．had adopted

D．could adopt

需求的构成要素有( )。

A．消费者的偏好

B．消费者的购买欲望

C．产品价格

D．替代效应

E．消费者的购买能力