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一个SAT语法问题Ironically,the eighteenth constitutional amendment

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一个SAT语法问题
Ironically,the eighteenth constitutional amendment prohibiting the sale of alcohol (may have been) responsible for the rise of organized crime in the 1920s.
括号里的你觉得对么?amendment 是一个单数名词,为什么用了have 而不是has?(本题来自PRINCTON,601页)
一个SAT语法问题Ironically,the eighteenth constitutional amendment
may 是情态动词后面要跟动词原形,has不是原形.而是have的第三人称单数了