I don't know what___(happen)to him

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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.
再问： my god，还有这种说法

I don't know what___(happen)to him Li Lei hasn't come yet.I don't know what___to him.A.happen B I don't know him. What___(happen)if we don't work hard? I don't know how to help him同义句 I Don't know how to love him歌词 I don't know whether you happen （）,but I’m going to study i Lucy hasn't come yet.I don't know what______(happen) to her. I don't know whether you happen to have heard,but I'm going I don’t know whether you happen _______,but I’m going to stu I don't know whether you happen----,but I am going to study I don’t know whether you happen _____,but I am going to stud