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Mr Chen told us that three fourths of the earth ________covered with water.
A.wereB.isC.wasD.are
B

试题分析:句意:陈老师告诉我们地球的四分之三都被水覆盖着。宾语从句中的事实为客观真理,所以时态用一般现在时,the earth做主语,后面的谓语动词用单数形式,故选B。
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