【题目】Working hard is not a __________ of great success, but it is among the essential requirements.
A. signB. signal
C. guaranteeD. mark
在线课程【答案】C
【解析】
考查名词。A. sign 标志，迹象；B. signal 信号；C. guarantee保证；D. mark符号。句意：努力工作不是取得巨大成功的保证，但它是必不可少的条件之一。故选C。
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