I didn't think it was that big a deal.

问题描述:

I didn't think it was that big a deal.
big deal 是"有什么了不起"的意思.that big a deal呢?that做什么成分?

嗯,big deal是"了不得"的意思.
that在这是个程度副词,表示"如此,那么", 相当于so. 作状语,修饰形容词big.
如: a kind person可以说so kind a person, 将形容词提前以表强调.