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    It was only after some progress in the use and development of electricity 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 【查看更多】

     

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    It was only after some progress ____ in the use and development of electricity 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

     

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