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It was only after some progress ______ in the use and development of electric current that men began to realize the importance a
It was only after some progress ______ in the use and development of electric current that men began to realize the importance a
admin
2010-04-24
66
问题
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.
选项
A、had been made
B、would have been made
C、has been made
D、was made
答案
A
解析
被动语态。make progress in...的被动语态是progress is made in...。
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专业英语四级
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