◎ 题干
____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet.”
[     ]
A. Seen      
B. Seeing      
C. Having seen  
D. To see
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“____ from space, our earth, with water covering 70% of its surface, appears as a “blue planet.”[ ]A. Seen B. SeeingC. Having seen D. To see…”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。