◎ 题干
_____ Monday morning he wrote an article on grammar. 
_____ Monday morning he had written an article on grammar. 
A.ByB.OnC.AtD./
◎ 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“ _____ Monday morning he wrote an article on grammar._____ Monday morning he had written an article on grammar.A.ByB.OnC.AtD./…”主要考查了你对  【介词和介词短语】  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。