He looks unhappy today.What ____(happen)to him? 请问横线上填happen

He looks unhappy today.What ____(happen)to him? 请问横线上填happen he looks unhappy what( happen) to him 填啥些原因 He seem ___(be) unhappy today.What ___(happen) to him what will happen to him 与what he will happen的区别放在宾语从句里 what is happen to him what is the matter with him how is he. ( )would happen to him? -Why is he absent today?-Something_to him.Acould have happen 请问老师,what happen to you? 1、（ ）Millie looks unhappy today.What _________ to her. what happen to sb. What happen to What ____ you yesterday A happen B happen to C happened to D