过去进行时与一般过去时

更新时间2019-12-08 05:35:59

我在上海工作时常常坐飞机回家这句话: i used to go home by air when i worked in Shanghai.

i used to go home by air when i was working in Shanghai.

以上是选择用一般过去时还是过去进行时,为什么?

我在上海工作时常常坐飞机回家这句话: i used to go home by air when i worked in Shanghai.

以上是选择用一般过去时