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    When first to the market, these products enjoy great success. A. introducing B. introduced C. introduce D. being introduced 【查看更多】

     

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    When first         to the market, these products enjoy great success.

    A. introducing      B. introduced  C. introduce        D. being introduced

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    When first ________ to the market, these products enjoy great success．

    [　　]

    A．introducing

    B．introduced

    C．introduce

    D．being introduced

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