2. 外语
  3. (see)______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".

(see)______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".

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问题 (see)______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".
选项
答案Seen
解析 第一个逗号之后是一个完整的句子，所以逗号前只作该句的某种成分，此处作状语。由于句子的主语our earth与see之间是被动关系，所以用过去分词表被动。
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