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  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 本题考查独立主格结构，动词是ing形式还是ed形式由句子主语和该动词的关系决定。此题地球是被看到的，故用过去分词形式；而to be seen表示将要被看到的。
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