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

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

admin2013-09-03  62
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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