The great invention he made ___ of great benefit to the whole world.[ ]A. is provedB. has provedC. has been provedD. is proved to be -高中英语-魔方格

◎ 题干

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

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◎ 解析

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◎ 知识点

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