Why did you throw the bottle out of the window?you横线部分的正确答案是could have hurt,为什么不是might hurt?

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Why did you throw the bottle out of the window?you
横线部分的正确答案是could have hurt,为什么不是might hurt?

从did you throw 看出这个事情发生在过去,
could have hurt 意思是:你当时有可能伤着别人,是对过去的虚拟,只能用could have done