根据（）的基本机理，农业银行建立统一的授权管理制度。

A．横向平行制衡

B．纵向权限制约

C．纵向权限制衡

D．横向平行制约

I ________ the piano when I was a little child, but I haven’t played recently, so I have forgotten

a lot.[ ]

A. blew up      

B. put up          

C. took up          

D. packed up