解释语法the man drank a little more than was good for him

问题描述:

解释语法the man drank a little more than was good for him
the man drank a little more than was good for him
was 是什么用法,定语从句吗?为什么可以这么用
有人说省略了what ,what在后句中做主语,为什么可以省略

这句话是定语从句
不能省略了that
The man drank a little more than that was good for him
that也可以用which代替