问题描述：
I saw her reading a seience book an the bus.最佳答案：
I didn't see her reading a science book on the bus. ? ?
最佳答案：
题目：改为否定句I saw her reading a seience book an the bus.
最佳答案：
关键字：
问题描述：
I saw her reading a seience book an the bus.I didn't see her reading a science book on the bus. ? ?