i don't know the man( )black hat A about B wear C put on D i

in,我不认识那个男人,哪个男人?戴黑帽子的那个.in black hat用来形容前文所述的男人,以完整表达意思,about不合适,wear,put on是动词,与black hat连用仅仅是动词短语,戴上帽子,故选in.