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    Mr. Black used to a teacher. But now he is a writer. A. / B. is C. be D. being 【查看更多】

     

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    Mr. Black used to ________ a teacher. But now he is a writer.

    [      ]

    A. /
    B. is
    C. be
    D. being

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    Mr. Black used to _____ a teacher. But now he is a writer.
    [     ]
    A. /
    B. be
    C. is
    D. being

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    Mr. Black used to _________ a teacher．But now he is a writer．

    A．／          B．is            C．be               D．being

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