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【题目】As we all know, about 75 percent of the earth_______covered by water.

A. is B. are C. am D. were

【答案】A

【解析】句意:我们都知道,地球的75%被水覆盖。基数词+percent of表示……的百分之几十,由分数修饰的主语后面谓语动词的数,和被修饰主语的单复数保持一致。earth表示单数含义,故答案选A。

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