◎ 题干
It takes 10-12 days ____ from the Earth to the Moon ____ rocket.
A.to travel, by B.traveling, on
C.travel, on D.traveling, by
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It takes 10-12 days ____ from the Earth to the Moon ____ rocket.A.to travel, byB.traveling, onC.travel, onD.traveling, by…”主要考查了你对  【不定式】【分词】【动名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。