the fertilizer ()effective after tested in the fieldA,were proved B,were proved to be C,proved D,have been proved解释一下为什么及句子成分

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the fertilizer ()effective after tested in the fieldA,were proved B,were proved to be C,proved D,have been proved解释一下为什么及句子成分
the fertilizer ()effective after tested in the field
A,were proved B,were proved to be C,proved D,have been proved
解释一下为什么及句子成分

the fertilizer ()effective after tested in the fieldA,were proved B,were proved to be C,proved D,have been proved解释一下为什么及句子成分
选C.proved
解析:
这个动词能用主动,也能用被动.但是A、B、D的谓语动词都是跟复数的主语,所以排除了.
只能选C.
成份:
主语:the fertilizer
谓语动词:proved (系动词)
表语:effective
状语:after tested in the field

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