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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: 此题考查了情态动词的用法。“must+have+过去分词”表示对过去发生事情的一种较为肯定的推测,而“should+have+过去分词”表示应该做到而实际上没有做到的事情。
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