问题补充:
—Must I clean my room now, Mum?
—. You can do it tomorrow.
A. No, you needn’t
B. No, you mustn’t
C. Yes, you need
D. Yes, you must
答案:
(答案→)A. No, you needn’t
B. No, you mustn’t
C. Yes, you need
D. Yes, you must
解析:句意:妈妈,我现在必须打扫我的房间吗?联系下文,你可以明天做。可知上文为否定回答。must的否定式一般借助于needn’t和don’t have to构成。故选A。