— I'm leaving tomorrow.

— Oh, what a pity! I won't be able to see you off. I __ a tele-conference the whole morning.

A．have

B．am having

C．will be having

D．will have had

现金流量图可以全面、直观地反映经济系统的资金运动状态，其中现金流量的三大要素包括( )。

A．现金流入的大小、方向和时间点

B．投入现金的额度、时间和回收点

C．现金流量的大小、方向和作用点

D．现金流出的额度、方向和时间点