She is already two hours late.What____to her?A can have happened B must have happened C should have happened D must happen

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She is already two hours late.What____to her?
A can have happened B must have happened C should have happened D must happen

选A 因为后面是一个问句 不应该用B的 而 can表示的是对事情的可能性猜测 should是表示应该 并且是本应该 不符合语境 故选A