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    By the time he was 38, he had become principal of university. A. /; an B. /; a C. a; an D. a; the 【查看更多】

     

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    By the time he was 38, he had become ________ principal of ________ university.

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

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