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
网友回答
A. Seeing …... covering
(答案→)B. Seeing …... covered
C. Seen ...... covering
D. Seen …... covered
解析：考查非谓语动词。第一空we与See 为主谓关系用现在分词作状语；第二空the earth与cover为动宾关系用过去分词。从太空上看我们发现地球百分之七十的表面被水覆盖着。