from space, the earth with water 70％ of its surface looks like a “blue blanket”.A. Seen; c

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A. Seen; covered
B. Being seen; covers
C. Seeing; covering
(答案→)D. Seen; covering
解析：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。