Milk bottles need cleaning thoroughly before they are used again,___ they?don't mustn't aren't
问题描述:
Milk bottles need cleaning thoroughly before they are used again,___ they?
don't
mustn't
aren't
答
aren't
答
应该用aren't,表被动,牛奶杯在再次使用之前要被彻底地清理干净,不是吗?
答
don't
Milk bottles need cleaning thoroughly before they are used again,don't they?