◎ 题干
“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .
A.explainedB.explain
C.explainingD.having 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““ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” . A.explainedB.explainC.explainingD.having explained…”主要考查了你对  【全部倒装】【部分倒装】【省略句】  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。