from space the earth with water seventy percent of the surface looks like a blue bal

问题补充：

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

A. Seen ; covered

B. Seen ; covering

C. seeing ; covering

D. Seeing ; covering

答案：

A. Seen ; covered

(答案→)B. Seen ; covering

C. seeing ; covering

D. Seeing ; covering

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