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

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