_____ Monday morning he wrote an article on grammar. 

_____ Monday morning he had written an article on grammar. 

A. By    B. On    C. At      D. ／

B


解析:

A.用on（at）＋過去時(shí)間狀語,句子用過去時(shí)；by＋過去時(shí)間狀語,句子用過去完成時(shí).

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