—Tom is in low spirits today. He again in the job interview.—What a pity! He has been gr

问题补充：

—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：

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。