—Tom is in low spirits today. He again in the job interview.
—What a pity! He has been greeted with bad luck these days.
A. could fail
B. may fail
C. must have failed
D. must fail
网友回答
A. could fail
B. may fail
(答案→)C. must have failed
D. must fail
解析：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。