______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、See
B、Seeing
C、Seen
D、To be seen

答案C

解析 这是(过去)分词短语作状语,表示时间或条件,意思相当于when/if(it is) seen from space。
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