Jim is unhappy, do you know ?
A. what he happened
B. what the matter is with him.
C. what happened to him
D. what did he happened
网友回答
A. what he happened
B. what the matter is with him.
(答案→)C. what happened to him
D. what did he happened
解析：what happened to sb表示某人发生什么事情了，为固定词组搭配，故选C