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    精英家教网 > 高中英语 > 题目详情
     30 % of the young trees, attacked by diseases, ________pine trees.
    A．isB．areC．wasD．has been
    B
    本题考查主谓一致，百分数+名词，其后的谓语动词与名词保持一致，故谓语动词用复数。句意：遭受病害3 0%的小树是松树。
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