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―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。“must+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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*                *                  *

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