Never______ such a difficult problem. It took me almost half an hour to work it out.
A.had I come across
B.I had come across
C.did I come across
D.I did come across
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◎ 知识点
根据n多题专家分析,试题“ Never______ such a difficult problem. It took me almost half an hour to work it out.A.had I come across B.I had come acrossC.did I come acrossD.I did come acr…”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。
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