◎ 题干
Not until _____,_______the diffiult problem.
A.did he return;we settledB.he returned;we settled
C.did he return,did we settleD.he returned;did we settle.
◎ 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“Not until _____,_______the diffiult problem.A.did he return;we settledB.he returned;we settledC.did he return,did we settleD.he returned;did we settle.…”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。