◎ 题干
_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ball
A.Seen; coveredB.Seeing; covering
C.Seen; coveringD.Seeing; covered
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“_______ from the moon, our earth, with water _______seventy percent of its surface, appears a blue ballA.Seen; coveredB.Seeing; coveringC.Seen; coveringD.Seei…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  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。