问题
选择题
—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
答案
C
题目分析：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。