-Mum，I'mgoingclimbing．MustIcleantheroomnow？-No，you

问题详情：

-Mum，I'm going climbing．Must I clean the room now？

-No，you_____________．You can do it this evening．

A．can't   B．mustn't     C．needn't

【回答】

C

知识点：情态动词

题型：选择题