Her favourite food is milk and eggs.
在这里be动词是is,因为food是不可数的
Milk and eggs are her favourite food
在这里be动词是are 因为有两种食物
两种都对。
BS抄袭
她喜欢的食物是牛奶和鸡蛋
英文:Her favorite food is milk and eggs。
Her favourite food is milk and eggs
Her favourite food are milk and eggs
Milk and eggs are her favourite food