我曾在

I was once at/in

→ 我
phrase Rare #26,605
I was once at/in Introduces a place or setting where the speaker was or did something in the past.
CH: 我曾在北京住过一年。
EN: I once lived in Beijing for a year.

我曾在搬家公司工作过溜进去偷出来的

I used to work for a moving company—I snuck in and stole it.

— 空之境界 第五章 矛盾螺旋 (2008)

我曾在罗马生活过。

I once lived in Rome.

我曾在英国留学英国淑女全要

I studied in the UK, where all the ladies are proper English ladies.

— 小姐 (2016)

我曾在一家饭店工作过。

I used to work at a restaurant.