问题
选择题
_____from the moon ,our earth with water ____70% of its surface, appears as a “blue ball”
A．seen；covered
B．seeing; covering
C．seen；covering
D．to see; to cover
答案
答案：C
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_____from the moon ,our earth with water ____70% of its surface, appears as a “blue ball”
A．seen；covered
B．seeing; covering
C．seen；covering
D．to see; to cover
答案：C