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What can have happened to her

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What can have happened to her
29.She's already an hour late,What _____to her
A can have happened B may happen C should have happened D may have happened
为什么选A,B\D有什么不对吗
What can have happened to her
BC肯定不对,因为B时态不对,就算不是A也该是D,而C中should用得不对
A和D中选A我是因为may带有个人推测的成分,表示很不确定,而can是一种比较客观的可能性的阐述,所以选A