are covered C) is covered,have been covered D) was cove-找考题网

单项选择题

Seventy-five percent of the surface of the earth ______ by water.
A) are covered C) is covered
B) have been covered D) was covered

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单项选择题Our sports meeting has been ______ because of the heavy rain. A) protested C) kept B) prevented D) postponed

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