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    【题目】One-third of the area _____ covered with trees. About seventy percent of the trees _____ been planted recently.
    A.is; have
    B.is; has
    C.are; have
    D.are; has

    【答案】A
    【解析】句意：这个地方三分之一被树覆盖，70%的树是最近种的。第一个句子主语是area是不可数名词，动词用单数；第二个句子主语是trees是可数名词，动词用复数。故选A。

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