----CanIwalkacrosstheroadnow,mum?----No,you

问题详情：

----Can I walk across the road now, mum?

---- No, you_______. You have to wait until the light turns green.

         A. couldn't       B. shouldn't         C. mustn't          D. needn't

【回答】

C

知识点：情态动词

题型：选择题