I didn't know where the young man ______ (come) from

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Ididn''tknowwheretheyoungman______(come)fromIdidn''tknowwheretheyoungman______(come)fromIdidn''tknowwhe

I didn't know where the young man ______ (come) from
I didn't know where the young man ______ (come) from

I didn't know where the young man ______ (come) from
came
我不知道这位年轻人来自哪里.