Working hard is not a __________ of great success, but it is among the essential requirements. A. si...
2022-08-17 04:41:14 188次 天津市和平区2019届高三下学期第三次模拟考试英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Working hard is not a __________ of great success, but it is among the essential requirements.
A. sign B. signal
C. guarantee D. mark
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