—MayIwatchTVnow，Mum?—No，you        ．Youmustcleanyourroo...

问题详情：

—May I watch TV now，Mum?

—No，you         ．You must clean your room first．

         A．may not        B．needn't

         C．can't           D．mustn't

【回答】

C

知识点：情态动词

题型：选择题