Middle-class audiences who had grown up with the highly involved plots and fascinating characters of authors such as Dickens began to demand more sophisticated film narratives than had their predecessors.이 문장에서 than 뒤에 주어와 도치가 된 건 알겠는데 왜 동사가 had일까요?앞의 동사 무엇을 받을까요??
than their predecessors had (demanded ~)
^^;