the machine () satisfactory after being testedThe machine __ satisfactory after being tested.A has proved B has been proved C has been provenD is prove 选哪个?为什么?

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the machine () satisfactory after being testedThe machine __ satisfactory after being tested.A has proved B has been proved C has been provenD is prove 选哪个?为什么?
the machine () satisfactory after being tested
The machine __ satisfactory after being tested.
A has proved
B has been proved
C has been proven
D is prove
选哪个?为什么?

the machine () satisfactory after being testedThe machine __ satisfactory after being tested.A has proved B has been proved C has been provenD is prove 选哪个?为什么?
选A不会错.因为虽然prove既可做实义动词也可作系动词,但翻译为“证明是”时为系动词,且选项后为满意的 是个形容词,说明这里的prove为系动词,而系动词如smell,taste等是没选A不会错.因为虽然prove既可做实义动词也可作系动词,但翻译为“证明是”时为系动词,且选项后为满意的 是个形容词,说明这里的prove为系动词,而系动词如smell,taste等是没有被动语态的,所以只能选第一个.有被动语态的,所以只能选第一个.