问一道SAT语法题,英语厉害的炒鸡大侠帮帮忙吧!）

问一道SAT语法题,英语厉害的炒鸡大侠帮帮忙吧!）
Historically,fewer than twenty percent of the pop songs identified by music executives as likely to be hits have performed as expected.
句子的主干是fewer than twenty percent of the pop songs have performed as expected.
我想问的是那个定语部分：“ identified by music executives as likely to be hits ” 就等于“ which were identified by music executives as likely to be hits.” 关键是里面那个“as likely to be hits",如果换成” to be hits“我明白,但是 这个”as likely to be hits"我就不明白了,它是个什么结构或者什么用法,
这是北美卷的语法题，这道题选的是NO ERROR，所以我想弄清楚他到底是什么结构。