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

A. is B are C. was D. were

 

C

【解析】

試題分析：句意:過去這條河25%的水是臟的。這句話的主語是Twenty-five percent of the water ，百分?jǐn)?shù)修飾名詞做主語，這時謂語動詞的單復(fù)數(shù)形式應(yīng)該跟名詞的形式保持一致，water 是不可數(shù)名詞，所以這里應(yīng)該用單數(shù)形式，又根據(jù)句意和句中的in the past 可知，這里說的是過去的事情，故應(yīng)該用一般過去時，故選C。

考點：考查主謂一致和動詞時態(tài)。

 

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