______from space, our earth, with water covering 70% of its surface, appears as a 'blue planet'.
A.Seeing
B.To be seen
C.Seen
D.Having seen

A.A.Seeing
B.To
B.Seen
D.Having

【参考答案】

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......

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