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Twenty-five percent of the water in this river _____ dirty in the past.

A. is B are C. was D. were

 

C

【解析】

试题分析:句意:过去这条河25%的水是脏的。这句话的主语是Twenty-five percent of the water ,百分数修饰名词做主语,这时谓语动词的单复数形式应该跟名词的形式保持一致,water 是不可数名词,所以这里应该用单数形式,又根据句意和句中的in the past 可知,这里说的是过去的事情,故应该用一般过去时,故选C。

考点:考查主谓一致和动词时态。

 

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