Students mustn't smoke or drink while＿＿ at school.A.studyB.studyingC.to studyD.studied

Students mustn't _____ mobile phones at school students mustn't----(stand)on the chair in the classroom students mustn't----(stand)on the chair in the classroom,适当地动词适当地动词 mustn't needn't mustn't的用法? mustn't的用法 mustn't grumble mustn t有哪几种意思 mustn't什么意思 mustn't是什么意思 take……out of 造句不要ing形式！例：Students mustn't take the newspapers out of the library. Students mustn't smoke or drink while＿＿ at school.A.studyB.studyingC.to studyD.studied School students （）smoke because it is against the school rules.A.needn't B.couldn'tC.won't D.mustn't 急要Students in our school（） wear uniforms.They can wear anything they like.A、can't B.、don't have to C、mustn't D、have to oughtn't, mustn't, can't区别 添must或mustn't. mustn't的完全形式 关于英语句子（mustn't）All the students must wear uniforms in late November.(改为否定句）改为1.All the students mustn't wear uniforms in late November.2.All the students needn't wear uniforms in late November.那一句对?