※ 引述《moneyred (..)》之銘言：
: DENVER — One of three suburban Denver girls who authorities say tried to
: join Islamic State militants in Syria was confused about what her role would
: be if she had actually made it there, the girl's father said Tuesday.
: 請問此處的who authorities，我感到疑惑的是
: (1) authoritity 不是只有名詞解嗎? 如果用法是who authorities 不就怪怪的?
: (2) 此處who authorities 是做如何解呢?
: 以上，謝謝指點
就我理解的說說看
請其他人指點
原本應該是:
One of three suburban Denver girls (who authorities say [that she tried to join Islamic State militants in Syria]) was confused about...
()內是"One" of three suburban Denver girls的關係子句
[]內是名詞字句，say的受詞
that省略
she被who取代