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    Working hard is not a only of great success, but it is among the essential requirements. A. sign B. signal C. guarantee D. supposition 【查看更多】

     

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    Working hard is not only a____of great success, but it is among the essential requirements.
    [     ]
    A. sign
    B.signal
    C.guarantee
    D.situation

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    Working hard is not only a            of great success,but it is among the essential requirements.
    [     ]
    A.sign
    B.signal    
    C.guarantee
    D.proof

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    Working hard is not only a ________ of great success, but it is among the essential requirements．

    [　　]
    A．

    sign

    B．

    signal

    C．

    mark

    D．

    guarantee

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