2. 专升本
  3. ______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".

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

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问题 ______from space, our earth, with water covering 70% of its surface, appears as a "blue planet".
选项 A、Seeing
B、To be seen
C、Seen
D、Having seen
答案C
解析 see和our earth是受动关系，故用过去分词seen。
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