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    One?third of the area__________covered with green trees.About seventy percent of the trees

    __________been planted.?

    A.are; have            B.is; has                C.is; have                     D.are; has

    C?


    解析:

    “分数或百分数+of the+名词或代词”作主语时，谓语动词的单、复数形式取决于名词或代词的单、复数形式。?

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