如表示必要性,用MUSTN'T YOU?如：YOU MUST KEEP YOUR ROOM CLEAN,MUSTN'T YOU?（你们必须保持房间干净,对吗?） 如果表示猜测,就不用MUSTN'T YOU?如：YOU MUST BE MR.WANG FROM BEIJING,AREN'T YOU?（你一定/肯定是北...