About seventy percent of our earth by water.A. is covering B. is coveredC. are covered D. are covering 题目和参考答案——青夏教育精英家教网—

题目内容

About seventy percent of our earth _______ by water.

A. is covering B. is covered

C. are covered D. are covering

【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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