Before, when I was assigned a task, I was totally on my own but here we work in teams

Before, when I was assigned a task, I was totally on my own but here we work in teams. {A; B; C}

A. 以前，当我被分配了工作，我只关心我自己的事，而在这，我们相互体谅对方。

B. 之前，分配工作后，就我一个人干活，但现在大家都在干活。

C. 以前，我分配到的任务只能独立完成，而在这，我们是团队合作。