from space the earth with water seventy percent of its surface looks like a blue ball.A.

问题补充：

from space, the earth, with water seventy percent of its surface looks like a blue ball.

A. Seen; covered

B. Seen; covering

C. Seeing; covered

D. Seeing; covering

答案：

A. Seen; covered

(答案→)B. Seen; covering

C. Seeing; covered

D. Seeing; covering

解析：

这题考查非谓语动词的用法：第一空填seen，是过去分词做状语，因为the earth和see是被动关系，第二空填covering是with复合结构，因为water和cover 是主动关系。选B。