【題目】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標(biāo)記，符號(hào)；B．signal信號(hào)；C．guarantee保證；D．mark記號(hào)；句意：雖然努力不能保證成功，但它是最起碼的要求之一。根據(jù)句意，故選C。.

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