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    【题目】Working hard is not a ________ of great success，but it is among the essential requirements. （ ）
    A.sign
    B.signal
    C.guarantee
    D.mark

    【答案】C
    【解析】A．sign标记，符号；B．signal信号；C．guarantee保证；D．mark记号；句意：虽然努力不能保证成功，但它是最起码的要求之一。根据句意，故选C。.

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