She spoke as though she had already made up her mind.

as 在这里是连词，表示"如同...一样"，用于引导比较状语从句。 though 在这里是连词，表示"虽然、尽管"，但在这个结构中与 as 连用形成固定搭配。 as though 是一个固定短语连词，意思是"好像、仿佛"，用来引导虚拟语气或表示假设的情况。