He s_____ to be unhappy today.What has happened to him?

He seem ___(be) unhappy today.What ___(happen) to him He looks unhappy today.What ____(happen)to him? 请问横线上填happen He looks_____(worry).What happened to him? Tom look —— today.What has happened to him?A sadly B sad 答案系 what happened to him? he looks unhappy what( happen) to him 填啥些原因 what‘s ————to him?He is quite politely today A happened to B What do you suppose has happened to him? He’s late.What ____ have happened to him? what has happened to you I want to know what --------- him.A .happened B,has happened 选择 What ___ him just now?He is unhappy.A.happened B.happened