选b 从句,that代指the person who know him,在从句中作主语.选项中可做主语只有that和which,which一般不代指人.
选b that代词代指the building,从句即you live in the building.选项中可代指物的只有这一个.
选b 从句,that代指the person who know him,在从句中作主语.选项中可做主语只有that和which,which一般不代指人.
选b that代词代指the building,从句即you live in the building.选项中可代指物的只有这一个.