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    4．Theory is based on practice and serves practice． A．in turn B．by and by C．by chance D．in this case 【查看更多】

     

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    Theory is based on practice and ________ serves practice．

    A．in turn          B．by and by           C．by chance         D．in this case

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     Theory is based on practice and ________ serves practice．

    A．in turn                B．by and by           C．by chance           D．in this case

     

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    Theory is based on practice and ________ turn serves ________.

    [　　]

    A．on; the practice
    B．in; practice
    C．by; theory
    D．at; the theory

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    As is known to us, theory is based on practice and ________ serves practice.

    [　　]

    A．by chance
    B．in turn
    C．in return
    D．by turn

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