．---The movie 2012 will be on at 8 pm．What about picking you up at 7?

---All right．I will have come back from work by their, and I_________you at home．

A．will be waiting for

B．will wait for

C．have been waiting for

D．am waiting for

多媒体计算机系统的两大组成部分是()。

A．多媒体器件和多媒体主机

B．音箱和声卡

C．多媒体输入设备和多媒体输出设备

D．多媒体计算机硬件系统和多媒体计算机软件系统