She had been at the company for 10 years and knew all the ___.
A、ins and outs
B、up and down
C、on and off
D、back and forth
She had been at the company for 10 years and knew all the __ - Unit 01 Living Green - 全新版大学进阶英语:综合教程第二册 - 随行课堂 | 大学网课搜题引擎