— What's the noise? It sounds as if it comes from upstairs.

— _____. It must be the window-cleaner working, next door. [ ]

A. I'm not sure

B. I hope not

C. I'd rather not

D. I don't think so

战略数据规划方法实施时强调有正确的开发策略，并认为其关键应是

A．设计方法的选择

B．最高管理者参与

C．企业部门间沟通

D．数据库系统确定