题目内容
―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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