Many composers and musicians came to study and work in vienn

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?
再问： 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？
再答： 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？