This is the bady ()he is looking after .这题答案是 whom,定语从句题。先行词baby是人,又后面从句的宾语 who 先行词是人,又后面从句的主语例句 He is the personwho found my wallet.which 先行词是物,又后面从句的主语或者宾语 I don't like this cup of coffee which tastes too sweet....
This is the bady (whom)he is looking after因为是baby所以是被looking after的,baby在从句中是宾语,所以用whomI don't konw whom he will go with tommorrw.This is the boy who is looking after the bab...