这个英语题为什么选B不选DThe great invention he made( )of great benefit to the whole world.A is provedB has provedC has been provedD is proved to be

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这个英语题为什么选B不选DThe great invention he made( )of great benefit to the whole world.A is provedB has provedC has been provedD is proved to be

这个英语题为什么选B不选DThe great invention he made( )of great benefit to the whole world.A is provedB has provedC has been provedD is proved to be
这个英语题为什么选B不选D
The great invention he made( )of great benefit to the whole world.
A is proved
B has proved
C has been proved
D is proved to be

这个英语题为什么选B不选DThe great invention he made( )of great benefit to the whole world.A is provedB has provedC has been provedD is proved to be
B,用完成时,对现在有影响,而且是他的发明对世界有好处,是主动的,不用被动语态.