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         of the surface of the earth          covered with water.
A.Seven-tens...are B. Seven-tens…is
C. Seven-tenths...isD.Seven-tenths...are
C

试题分析:句意:地球表面的十分之七被水覆盖。分数的基本形式为分子为基数词,分母为序数词,分数视为一个整体,单数,故选C.
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