he looks unhappy what( happen) to him 填啥些原因

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he looks unhappy what( happen) to him 填啥些原因
he looks unhappy what( happen) to him 填啥些原因

he looks unhappy what( happen) to him 填啥些原因
填happened
已经unhappy了,所以这个事情应该是发生在过去,所以谓语动词用过去式