你好,连接词在宾语从句中充当宾语的时候用whom.
例如： I love the girl. Jim loves the girl. 变为宾语从句 Jim loves the girl whom I love.
先行词the girl是人,连词只能是that/who/whom/whose,宾语从句是 whom I love. whom是love的宾语,所以用宾格whom.
in which/ at which/ with which, 要考虑动词词组
例如：This is the city. I have lived in the city. 变宾语从句 This is the city in which/where I have lived. 这个宾语从句中把介词 in 提前,和which做连接.
祝你学习进步!
再问： 我是说定语从句
再答： 不要意思，我打错了，我打的是宾语从句，实际上是定语从句。
