and换成OR
并列关系不要
选择关系要
where did composers and musicians come to study and work?谢谢，能不能具体点啊？句型转换They have swept the floor and cleaned the window.They ----------swept the floor ---------cleaned the window.怎么做啊？具体。。。具体就是比如你今天中午想吃三明治还是牛排？这时候就用OR你这个句型转换要转成什么句？否定？