对供应商的阶段性评价体系的特点是（）。
A．流程封闭化
B．流程透明化
C．操作公开化
D．操作隐蔽化
参考答案：B, C
All my homework ______,I watched TV with my parents.
A．done
B．doing
C．being done
D．had been done
