______ from space, our earth, with water covering 70% of its sur

______ from space, our earth, with water covering 70% of its surface, appears a “blue planet”.
A、Seen
B、Seeing
C、To be seen
D、Having seen
【正确答案】：A
【题目解析】：Seen 这是过去分词做地点状语,相当于If it's seen...