You must't pack your school bag when you hear the fire bell.(保持原意)
问题描述:
You must't pack your school bag when you hear the fire bell.(保持原意)
答
当你听到火警铃响的时候,不要去收拾书包。
答
只要把mustn't改成don't就行
答
当你听见火警钟声响起时,切勿收拾书包后才逃跑