Mr Zhao was teaching English when he was in Shenzhen.正确不?
问题描述：
Mr Zhao was teaching English when he was in Shenzhen.正确不?
答
也对的.能解释下吗？谢如果是过去式，就是陈述过去一个事实。如果是过去完成时，就强调在过去某个时间里，一直在做某事。