◎ 题干
To succeed in a scientific experiment _____ .  
A.carefulness is needB.carefulness is one needs
C.one needs to be carefulD.one need being careful
◎ 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“To succeed in a scientific experiment _____ . A.carefulness is needB.carefulness is one needsC.one needs to be carefulD.one need being careful…”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。