I don''t think it any use taking with him , you ____ as well leave him alone .

A．might

B．must

C．can

D．could

产业结构优化应符合的要求有( )。

A．产业结构合理化

B．产业结构高度化

C．产业的均衡发展

D．产业结构多元化

E．产业发展的速度、质量和效益