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    He was medical student before he turned engineer. A. a; an B. the; the C. a; / D. /; an 【查看更多】

     

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    He was ______ medical student before he turned _______ engineer.

      A. a; an           B. the; the       C. a; /            D. /; an

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    He was ______ medical student before he turned _______ engineer.

      A. a; an           B. the; the       C. a; /            D. /; an

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