Being able to speak another language fluently could be a great when you’re looking for a

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(答案→)A. advantage
B. chance
C. assistance
D. importance
解析：A 考察名词辨析。句意：能流利说另外一门语言在你找工作的时候是一种很大的优势。Advantage优势，优点，有利条件；chance机会，可能性；assistance协助，援助；importance重要性。