查人人中国名人网铁离子与二氧化硫反应:英语问题````
来源：百度文库 编辑：查人人中国名人网 时间：2024/07/04 22:56:53
We found that the problem was very hard.
转成被动语态,有点难度的`````
转成被动语态,有点难度的`````
The problem was found very hard(by us).
It was found to me that the problem was difficult.
the problem was found very hard by us
the problem was found very hard by us
the problem were found by us very hard
The problem was found very hard(by us).