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Ninety-six point five percent of the water on the earth ______ sea water.
A.areB.isC.wasD.were
B
考查主谓语一致性。百分数和分数做主语要依据它们后面接的词而定,是名词复数形式的用复数谓语动词;反之用单数谓语动词。此处water为不可数名词,为一般事实,故选B符合。
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