______ 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

________from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.

1. A.
   Seen
2. B.
   Seeing
3. C.
   To see
4. D.
   Having seen

___ from space, our earth, _____with water 70% of its surface, appears as a “blue planet”.

A. Seeing, covering 　　　　　　　 B. Having seen, covered

C. To see, covered 　　　　　　　　　 D. Seen, covering

 ______from space, our earth, ______with water 70% of its surface, appears as a “ blue planet”

   A. Seeing, covering    B. Having seen, covered    C. To see, covered    D. Seen, covered