I don't know whether you happen to have heard,but I'm going to study in the USA this September.我一直在纠结一个问题 为什么这里要说you happen to have heard 而不是 you have happened to hear?

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• I don't know whether you happen to have heard,but I'm going to study in the USA this September.我一直在纠结一个问题 为什么这里要说you happen to have heard 而不是 you have happened to hear?
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