must Jim finish cleaning the classroom before five o'clock (作否定回答）
问题描述：
must Jim finish cleaning the classroom before five o'clock (作否定回答）
No,he doesn't______ ______
答
need to或者have to
因为对must做否定翻译为不必要时,不能直接使用mustn“t 因为它的意思为禁止
所以应使用have to 或者need to