— Did you ___________ a cake for your mother?

— Yes, I ___________.[ ]

A. made, made

B. make, did

C. made, did

决定模拟分权制成败的关键之一是（）

A．事业部的划分 

B．模拟的精确性 

C．生产阶段的划分 

D．企业内部价格