Working hard is not only a of a great success, but is among the essential requirement.A. s

发布时间：2020-08-17 12:02:28


Working hard is not only a     of a great success, but is among the essential requirement.
A. sign
B. signal
C. guarantee
D. marks

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A. sign
B. signal
(答案→)C. guarantee
D. marks
解析：考查名词词义辨析。Guarantee保证符合句意；sign迹象，符号；signal信号，暗号；mark 痕迹。
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