―Tom is never late for work. Why is be absent today?

―Something ________ to him.

      A．must happen                                        B．should have happened     

      C．could have happened                             D．must have happened

D

解析： 此題考查了情態(tài)動(dòng)詞的用法�！癿ust＋have＋過(guò)去分詞”表示對(duì)過(guò)去發(fā)生事情的一種較為肯定的推測(cè)，而“should＋have＋過(guò)去分詞”表示應(yīng)該做到而實(shí)際上沒(méi)有做到的事情。
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