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    program has been developed up to this date, but none of them are economical enough to be carried out now. A. All B. Several C. Either D. Many a 【查看更多】

     

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    _________ program has been developed up to this date, but none of them are economical enough to be carried out now．

    [　　]
    A．

    All

    B．

    Several

    C．

    Either

    D．

    Many a

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