____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

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____fromspace,ourearth,withwatercovering70%ofitssurface,appearsasa"blueplane".选项有a.seeingb.tobeseenc

____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
____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

____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
c.seen
这是过去分词做地点状语,相当于If it's seen...