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

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
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

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.

4 表示很肯定的虚拟语气

D，MUST DO对现在比较肯定的猜测，MUST HAVE DONE，对过去比较肯定的猜测。句子意思如下：TOM从不迟到，今天怎么没来？
肯定有事情发生了

情态动词+动词原形 表现在动作
情态动词+have+动词原形 表已经发生的动作
must ,could 表推测，前者肯定，后者否定
could还可以表能力

情态动词后的动词使用原型，所以是A