Question

看看这个英语句子对吗

That would surely be true if a cloned individual were treated as a lesser being, with fewer rights or lower status.

为什么是were ？

Answer 1

这是虚拟语气，它表达的内容与现在的事实相反。

另例：
If I were you, I would not learn English. （如果我是你，我就不学英语。）

正式语体或书面语需要用were，口语中可以用was。

Answer 2

把were改成was

如果一个克隆人被视作低人一等，享受不到常人的权利或地位，这自然是对的。

Answer 3

were treated 在一切，是treat的被动/过去时，这里也因为是虚拟语气