◎ 题干
 
14.This doubt had been in my mind for some time, but the research still went on____some reasons.
A.toB.aboutC.forD.In
◎ 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“14.This doubt had been in my mind for some time, but the research still went on____some reasons.A.toB.aboutC.forD.In…”主要考查了你对  【介词和介词短语】  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。