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About seventy percent of our earth _______ by water.

A. is covering B. is covered

C. are covered D. are covering

B

【解析】

试题分析:句意:我们的地球大概有70%都被水覆盖。此试题根据句意,地球应该被水覆盖,故使用被动语态be covered by;同时根据地球是单数,因此需要把be写成单数;两者结合,即可推知答案。故选B。

考点:考查被动语态。

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