I was on duty

I was on duty 基本解释

我当时在值班

I was on duty 用法和例句

1、While I was on duty, I always try my best to minimise mistake.

每次我执行任务时，都会竭力将失误降至最低点。

重点词汇

duty n. 职责，责任；义务；职责或工作；税收