查人人中国名人网optoma投影机价格表:主动改被动
来源：百度文库 编辑：查人人中国名人网 时间：2024/05/08 11:37:23
要3句主动语态的句子改为被动语态。要列举不要结构
They know that he is an expert.
It is known that he is an expert.
The manager has not signed the papers.
The papers have not been sogned by the nabager.
I posted that letter last night.
That letter was posted last night.