问题描述：
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
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
问题解答：
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