因为这个句子的主语是our earth,地球是被看,所以直接用过去分词就可以了.having seen 其实不是一个过去分词,而是一个完成时的现在分词,根据字的主语地球应该是一种主动关系,不表被动而是表完成.
_______from space,our earth,with water covering 70/ of its s
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