HELP!一道初三英语题

题目

HELP!一道初三英语题
Could you tell me_____?
a)who you are waiting for
b)where you live in
为什么b选项不对?
能否详细一点,为什么改成where you live 就对了 ?
【那么who是否本身不含有介词?】

答案

where表“在哪儿/向哪儿”时本身就含有介词,如“Where are you living?”、“Where are you going?”,where表“从哪儿”时则不含介词,如“Where do you come from?”；此处从句中可用“where you live”或“in which you live”