—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