--- I don’t suppose the police know who did it.  

--- Well, surprisingly they do. A man has been arrested and ____ now.   [ ]

A. has been questioned      

B. is being questioned  

C. is questioning          

D. has questioned

制约人的行为和动机的根本条件是

A．传统意识

B．阶级关系

C．生产方式

D．政治制度