from the moon our earth with water seventy percent of its surface looks like a blue sp

问题补充：

from the moon, our earth with water seventy percent of its surface looks like a blue sphere.

A. Seen; covered

B. Seeing; covering

C. Seen; covering

D. Seeing; covered

答案：

A. Seen; covered

B. Seeing; covering

(答案→)C. Seen; covering

D. Seeing; covered

解析：句意：从月球上看，我们地球表面的70%都被水覆盖，看起来就像一个蓝色的球。“我们的地球”和“看”之间是被动关系，所以第一个空用过去分词作时间状语；第二个空，“水”和“覆盖”之间是主动关系，故用现在分词，选C。