from space we can find 70% of the surface of the earth by water.A. Seeing …... covering

问题补充：

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

答案：

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。