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：本题考查分词短语作宾语补足语和状语。在with复合结构中，宾语补足语covering
70% of its surface和宾语water构成主动关系，故应使用现在分词。seen from space 在句中作状语，和主语the earth构成被动关系，故使用过去分词。