Seventy-five percent of the surface of the earth ______ by water.

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问题 Seventy-five percent of the surface of the earth ______ by water.

选项 A、are covered
B、have been covered
C、is covered
D、was covered

答案C

解析句子意为：地球表面的75%都被水所覆盖。本题测试主谓一致。因surface是不可数名词，故谓语用单数形式。

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大学英语三级B级

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