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问题: 英语题

Tom is never late for work .Why hasn't he come yet now?
Something ( ) to him.
A.must have happened B.should have happened
C.could have happened D.must happen

解答:

选D
tom从不迟到,今天却缺席了。是发生了什么。
说明是“一定”,肯定的,应当用must,
tom已经缺席,说明事情已经发生了,用完成时态。