I don't know what___(happen)to him 为什么填的是has happened 而不是happened

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I don't know what___(happen)to him 为什么填的是has happened 而不是happened

I don't know what___(happen)to him 为什么填的是has happened 而不是happened
I don't know what___(happen)to him
为什么填的是has happened 而不是happened

I don't know what___(happen)to him 为什么填的是has happened 而不是happened
因为说这句话的时候sth已经发生了,要用完成时,并且,如果你用happened,是过去式,而你前面的句子i don't know是一般现在时,前后矛盾的.补:如果前面是I didn't know,那句子就是I didn't know what had happened to him.