c.seen
这是过去分词做地点状语,相当于If it's seen...
____from space,our earth,with water covering 70% of its surface,appears as a "blue plane".
____from space,our earth,with water covering 70% of its surface,appears as a "blue plane".
选项有 a．seeing b.to be seen c.seen d.have seeing
选什么,为什么啊
选项有 a．seeing b.to be seen c.seen d.have seeing
选什么,为什么啊
英语人气：563 ℃时间：2019-11-21 00:35:42
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