I'm not familiar with this place. It's the first time I _____ here, you know. [ ]

A. am

B. was

C. have been

D. had been

关于工程质量，下列选项中不属于其内容的是( )。

A．分部分项工程

B．工程专业技术质量

C．施工工序质量

D．使用材料设备质量