—Morn, must I clean my room now?
—No, you . You can do it in the afternoon.
A. mustn't
B. needn't
C. can't
D. don't
网友回答
A. mustn't
(答案→)B. needn't
C. can't
D. don't
解析：A. mustn't禁止 B. needn't 没有必要 C. can't 不可能 D. don't不；句意：妈妈，我必须现在整理我的房间吗？不，不用。你可以下午整理。故选B