题目内容

— Tom is never late for work. Why is he absent today ?
— Something _______ to him.
A．must happenB．should have happened
C．could have happenedD．must have happened
D
must have done表示对过去事情的肯定推断，意为：过去一定做了某事。A表示对现在或示来事情的肯定推敲；B意为：本应该发生；C意为：可能已经发生，口气不太肯定，由于前一句意为：汤姆上班从未迟到过，而判断他今天缺席一定是因为出了什么事了。
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