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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、Seen
B、Seeing
C、To be seen
D、Having seen
答案A
解析
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