—Excuse me, must I finish my homework now?

—No, you _______. You can hand it in tomorrow. [ ]

A. mustn't

B. needn't

C. shouldn't

D. wouldn't

( )是经营者之间进行市场竞争的最重要的方式和手段。

A．质量竞争

B．数量竞争

C．服务竞争

D．价格竞争