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(英语)关于prove的问题

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(英语)关于prove的问题
What he had said at the meeting __________ true.
A.proves
B.is proved
C.proved
D.was proved
给出答案的同时 请说明理由
(英语)关于prove的问题
答案应该是C.应为这里的 是系动词,后接 (to be) + n/ adj.意为“证明是”.
eg.He proves (to be) innocent.
My advice proved (to be) wrong.我的意见证实是错的.
该词也有实义动词的用法,为及物动词,“证明”.
eg.He has proved his courage in battle.他已在战斗中证明了自己的勇气.
he proved that Tom did not break into resident’s house
It proves that he is innocent.