题目内容

【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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