是him, 因为at是介词,后面要接宾格做宾语。
pron. 他(宾格)And I got to know him a little bit .我对他稍微有些了解。Think about him or her as a person .把他或她当成一个人来看待。It takes him two hours to get home .他要花两个小时才能到家。I 've known him for almost 22 years .我跟他认识快22年了。Another possibility : just wait him out .另外一种可能:等着他离开。