It was then that I suddenly rea来自lized I didn't bring my wallet.这句句子的结构是什么?

强调句 It is (was) 强调部+ that (who) + 句其部

结构强调仅限于主语宾语状语

It is from the s背盟曲un that we g去试害数科岩补渐究哪刘et light and h360问答eat.

It was not until I had read your letter that I understood the true state of affairs.