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C

解析试题分析：句意：--汤姆今天情绪低落。他在工作面试中一定又失败了。--真遗憾，最近他一直运气不好。因为是谈论的工作面试的事情，属于过去，排除ABD。因为从他情绪低落推断出：他一定是失败了，所以用must have done表示“过去一定做了…”。选C。
考点：考查情态动词的完成式的用法

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