五子棋在线手机玩免费:英语:请举出一些运用现在完成时和过去完成时的被动句。
来源:百度文库 编辑:中科新闻网 时间:2024/07/06 12:04:53
The door has been opened yesterday.
The door had been opened befor he was back.
What can be done has been done.
John had been in China for over a month till he went back to his own country a week ago.