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英语3.-Tom is never late for work. Why is he absent today?

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英语3.-Tom is never late for work. Why is he absent today?
3.-Tom is never late for work. Why is he absent today?
-Something _______ to him.
a.must happen b.should have happened
c.could have happened d.must have happened
为什么
考的是情态动词.
从前句判断,tom从不迟到,今天却缺席了.那一定是发生了什么.
表“一定”,肯定的推断,应当用must,先排除BC
此外,tom已经缺席,说明事情已经发生了,所以用完成时态.
答案选D.