— 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表示對過去事情的肯定推斷，意為：過去一定做了某事。A表示對現(xiàn)在或示來事情的肯定推敲；B意為：本應該發(fā)生；C意為：可能已經(jīng)發(fā)生，口氣不太肯定，由于前一句意為：湯姆上班從未遲到過，而判斷他今天缺席一定是因為出了什么事了。
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