_______ from space, we can find 70% of the surface of the earth _______ by water.

_______ from space, we can find 70% of the surface of the earth _______ by water.

1. A.
   Seeing …... covering
2. B.
   Seeing …... covered
3. C.
   Seen ...... covering
4. D.
   Seen …... covered

_______ from space, we can find 70% of the surface of the earth _______ by water.

     A. Seeing …... covering                           B. Seeing …... covered 

       C. Seen ...... covering                                     D. Seen …... covered

_______ from space, we can find 70% of the surface of the earth _______ by water.