The old man treated me as though I was a stranger. 是不是可以用were呢?

问题描述:

The old man treated me as though I was a stranger. 是不是可以用were呢?

要看具体语境.
如果这个old man和I认识,并且很熟,就用were,表示虚拟语气
如果不是,则用was