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______from space, the earth with water _______70% of its surface looks like a “blue blanket”.
A.Seen; coveredB.Being seen; coversC.Seeing; coveringD.Seen; covering
D

试题分析:考查非谓语动词的用法:第一空填seen是过去分词做状语,因为the earth和see是被动关系,第二空填covered做宾语补足语,这是with复合结构,water和cover之间是被动关系:句意是:从太空看,有水覆盖表面70%的地球看起来像个蓝色的毯子。选D。
点评:分词做状语的时候,如果动词与名词构成主动关系,就使用现在分词的形式;如果二者构成被动关系就使用过去分词的形式。
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