问题描述：
语法分析：they were signing a promissory note to which .
they were signing a promissory note to which every American was to fall heir.
请问 to which ... to fall heir是一个什么样的用法?
they were signing a promissory note to which every American was to fall heir.
请问 to which ... to fall heir是一个什么样的用法?
问题解答：
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