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题目
题型:不详难度:来源:
We know that about seventy percent _____ the earth _____ covered by water.
A./; isB.of; are
C.of; isD.about; are

答案
C
解析

试题分析:句意:我们都知道70%的土地都被水覆盖。百分数+名词做主语,谓语动词的选择要根据这个名词而定。本题中earth是不可数名词,因此谓语动词要用单数。故选C。
核心考点
试题【We know that about seventy percent _____ the earth _____ covered by water.A./; i】;主要考察你对动词的被动语态等知识点的理解。[详细]
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