What do they like to do?
help each other是做like的宾语,即他们喜欢的对象,所以要用他们喜欢做什么提问
如果划线的是each other,就要问Who do the like to help?因为each otehr是帮助的对象
What do they like to do?
help each other是做like的宾语,即他们喜欢的对象,所以要用他们喜欢做什么提问
如果划线的是each other,就要问Who do the like to help?因为each otehr是帮助的对象