My cousin went to Canada two years ago.He ___there for a few months and then went to America.

问题描述:

My cousin went to Canada two years ago.He ___there for a few months and then went to America.
A worked B would work C would be working D has been working .请解释为什么是A,和 then 有何关系呢

最后一句用了and连接两个句子,前后两句的动作先后发生.所以用worked .then是然后的意思,说明先在那里工作了几个月,再去美国.