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：句意：从太空看，表面70%被水覆盖的地球看起来象个蓝色的毯子。第一空是非谓语动词做状语，因为the earth和see是被动关系，用过去分词做状语，第二空是with复合结构，with+宾语+宾语补足语，因为water和cover是主动关系，用现在分词，所以选D。