请教英语问题非常急

Question

After having had class，she went out of the classroom。这个句子有个先后的顺序。但是第一句是缩略形式，after having had class的全称，老师说 after she was class，到底是什么

Answer 1

过去的过去用过去完成时，她走出教室是在上完可之后，after she had had class,she went out of the classroom追问

after she was class和after she had having class 为什么不对

追答

主和从局 有先后发生的顺序after having 就表示主句发生在从句之后

Answer 2

after having had class是非谓语动词作宾语，after +动名词+其他，=after she had had class,作的是时间状语从句。
after she was class是在她是课后，句法语义不通。
因为上完课后，老师才走出教室。所以用过去完成时时态。

Answer 3

After she had had class,she went out of the classroom .