题目内容：

I came in when she was reading 为什么错了?

优质解答

when 改为 while
如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导：
I came in while she was reading.
当此句改变主从句的位置时,则为：
When I came in,she was reading.