◎ 题干
_____several times,but unfortunately,the boy still couldn’t smooth away the problem on his own.
A.Having been explainedB.The problem having been explained
C.The problem had been explainedD.Although the problem had been explained
◎ 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“_____several times,but unfortunately,the boy still couldn’t smooth away the problem on his own.A.Having been explainedB.The problem having been explainedC.Th…”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  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。