题目内容
Mr Chen told us that three fourths of the earth ________covered with water.
| A．were | B．is | C．was | D．are |
B
解析试题分析：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。
考点：考查主谓一致和时态。
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