there were 22 players in the team,【这里没有并列连词】the youngest_____hardly more than 17years old
前面不是从句,前后两部分之间又没有并列连词,这样后面就不能出现句子了!因为从“句子类型”这个角度没法解释,所以用分词being
the youngest__being___hardly more than 17years old 是【“逻辑主语（名词（代词）+ 分词 的独立主格结构】
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