His theory___to be true. A.proved B.was proved C.is proved D.has been proved

分类: 作业答案 • 2021-12-31 10:36:44

问题描述：

His theory___to be true. A.proved B.was proved C.is proved D.has been proved
(为什么不用被动,是proved的固定形式吗?）

答

答案选a
prove不用被动