Working hard is not only a of great success, but is among the essential requirem
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Working hard is not only a________of great success, but is among the essential requirements.
A．sign B．signal
C．guarantee D．supposition
试题答案
C 考查名词辨析。句意：刻苦努力不是取得巨大成功的唯一保证，但它是基本条件之一。guarantee “保证”；signal “信号，暗号”；supposition “推测，推断”；sign “迹象，标记，符号”。