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    精英家教网 > 初中英语 > 题目详情
    We know that about seventy percent _____ the earth _____ covered by water.
    A．/; isB．of; are
    C．of; isD．about; are
    C

    试题分析：句意：我们都知道70%的土地都被水覆盖。百分数+名词做主语，谓语动词的选择要根据这个名词而定。本题中earth是不可数名词，因此谓语动词要用单数。故选C。
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