I also told them if they wanted a copy of my book ____ my office. I would be happy to send one to them.[ ]

A. to call            

B. call              

C. calling              

D. called

建设工程项目质量控制体系，一般应形成（）的结构形态。

A.多元化 

B.多层次 

C.结构化 

D.唯一性 

E.多单元