Bread and milk ____(be)a common breakfast in western countries.

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Bread and milk ____(be)a common breakfast in western countries.
Bread and milk ____(be)a common breakfast in western countries.

Bread and milk ____(be)a common breakfast in western countries.
is
a common breakfast 说明前面应该用单数
又bread and milk是同一类物质,都是food,所以也应该用单数...

啊??又是这个问题这里Bread and milk 是指一种食物,牛奶面包,根据主谓一致,所以用is, 建议楼主查阅相关语法书籍。。。主谓一致部分~!~!
Bread and milk ____(be)a common breakfast in western countries