___________ from space, the earth looks like a blue ball.
A．To seeB．SeeingC．SeeD．Seen
D
本題考查非費(fèi)用動(dòng)詞。句子主語(yǔ)是地球而不是人，故用過去分詞seen。句意：從太空看，地球看起來像一個(gè)藍(lán)色的球。
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