— When will the expert come and give the lecture on economic development?  

— Not until our program ____ by the authorities.[ ]

A. approves

B. is to approve

C. has been approved

D. will be approved

下列叙述中，正确的是( )。

A．计算机字长取决于控制总线的宽度

B．计算机字长取决于数据总线的宽度

C．数据库管理系统属于系统软件的核心

D．中央处理器可以直接访问任何一个部件