As we all know now，over________of the earth________covered with water．A.three-fourths．areB.thirds-fourth，haveC.third-fourth．areD.three-fourths，is
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D解析分析：three-fourths是正确的说法(相当于three quarters)．由于主语是over three-fourths of the earth，应该看of后面的名词earth，是单数形式，所以选D项。(延伸)some of也用相同方法来判断。