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

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

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问题 ______from space, our earth, with water covering 70% of its surface, appears a "blue planet".
选项 A、Seen
B、Seeing
C、To be seen
D、Having seen
答案A
解析 题干：从太空来看，地球看起来像是一个蓝色的星球，因为其表面的70％被水覆盖。本题测试非谓语动词；see的逻辑主语是句子的主语，即the earth，是see(看)这个动作的对象，二者之间为动宾关系，所以应该用被动式。故选A。
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