What food -------- she -------(like) best?

What food -------- she -------(like) best?
What food -------- she -------(like) best?

What food -------- she -------(like) best?
Does/ like

What food does she like best?

What food does she like best? 在句子中does是助动词，帮助句子构成一般现在时。而在疑问句中助动词要提到主语前。