The great invention he made _____ of great benefit to the whole world.[ ]A. is proved B. has proved

题目简介

The great invention he made _____ of great benefit to the whole world.[ ]A. is proved B. has proved

题目详情

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
题型:单选题难度:中档来源:0127 期中题

答案

B

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