It was only after some progress----in the use and development of electric current that men beganto realize the important and possibility of mageetism.Awas made B has been made C would have been made Dhad been made

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It was only after some progress----in the use and development of electric current that men beganto realize the important and possibility of mageetism.Awas made B has been made C would have been made Dhad been made

It was only after some progress----in the use and development of electric current that men beganto realize the important and possibility of mageetism.Awas made B has been made C would have been made Dhad been made
It was only after some progress----in the use and development of electric current that men began
to realize the important and possibility of mageetism.
Awas made B has been made C would have been made Dhad been made

It was only after some progress----in the use and development of electric current that men beganto realize the important and possibility of mageetism.Awas made B has been made C would have been made Dhad been made
D
“进步”在“意识到”前,且“进步”被取得

选D, 后面有began,过去式,而且前面是发生在began之前,所以用过去完成时,

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选D
这句话是个强调句型,强调时间。
再看时间,是发生在过去。然而又是在过去的过去,因为after后面有动词过去式began,说明是在began之前发生的动作。再看墙面名词progress在整个句子的意思(只有在对电的应用和发展到了一定的阶段人们才发现电磁学的)看来应该用过去完成时态。排除A过去式,B现在完成,C将来完成时或虚拟,所以选择D过去完成时。
谢谢采纳...

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选D
这句话是个强调句型,强调时间。
再看时间,是发生在过去。然而又是在过去的过去,因为after后面有动词过去式began,说明是在began之前发生的动作。再看墙面名词progress在整个句子的意思(只有在对电的应用和发展到了一定的阶段人们才发现电磁学的)看来应该用过去完成时态。排除A过去式,B现在完成,C将来完成时或虚拟,所以选择D过去完成时。
谢谢采纳

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答案:D
B首先排除,因为前面是it was,过去式,has, 现在
A排除,Process已经完成
C是虚拟语气,与句子不符
只有在完成磁力运用到电力学这一些进步中,人们才开始意识到磁性的重要性和潜在可能性。

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