—  ___ you ___ him around the museum yet?

—  Yes. We had a great time there. [ ]

A. Have … shown

B. Do … show

C. Had … shown

D. Did … show

完成企业目标所需的各项业务工作及其比例关系的结构是( )。

A．层次结构

B．职能结构

C．部门结构

D．职权结构