摘要： Monday morning he wrote an article on grammar. Monday morning he had written an article on grammar. A. By B. On C. At D. /

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_ Monday morning he wrote an article on grammar. _ Monday morning he had written an article on grammar.

_____ Monday morning he wrote an article on grammar.

_____ Monday morning he had written an article on grammar.

A. By B. On C. At D. ／

_____ Monday morning he wrote an article on grammar. _____ Monday morning he had written an article on grammar.