当指代人的关系代词在定语从句中做宾语时,既可以用who ,也可以用 whom,但是如果关系代词前有介词时,只能用whom.
I don't know the girl who/whom/that our teacher is talking with.
There are twenty girls in our class,three of whom are good at football.
The girl with whom I went to see my friend yesterday is Mary.
答：详情>>
