作业帮一道牵涉到时态的英语竞赛题.求助大神解释~~
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/07/16 17:02:18
一道牵涉到时态的英语竞赛题.求助大神解释~~
It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.
A.was made B.would have been made
C.has been made D.had been made
It was only after some progress ____ in the use and development of electric current that men began to realize the importance and possibilities of magnetism.
A.was made B.would have been made
C.has been made D.had been made
D It was...that.为典型强调句
即Men began to realize.only after some progress_____in the use...
意为只有在电流的使用和发展取得进步后,人们才开始了解到电磁的重要性和可能性.
had done为过去完成时,表示在began（一般过去式）的动作之前.
即Men began to realize.only after some progress_____in the use...
意为只有在电流的使用和发展取得进步后,人们才开始了解到电磁的重要性和可能性.
had done为过去完成时,表示在began（一般过去式）的动作之前.