◎ 题干
Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
A.that B.as C.so that D.which
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Last term our maths teacher set so difficult an examination problem _____ none of us worked out.A.thatB.as C.so thatD.which…”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。