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she is already twe hours late.What____to her?

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she is already twe hours late.What____to her?
A can have happened B must have happened C should have happened D must
happen
为什么不选B呢?
she is already twe hours late.What____to her?
选C
B中的must太肯定了,这个是推测,没法做出如此肯定的推导的.
请及时采纳,多谢!
再问: 可是它前面说她已经迟到两个小时了,那肯定发生了什么事?很通啊,况且答案选A
再答: 我认为C比A好。 按照你的意思,应该说:Something must have happened to her. 可这句是What引导的,它不仅说肯定发生了某事,还在说这件事肯定是一件什么事。这就无法肯定了。谁知道是什么事呢?