one of +名词后接定语从句,先行词是这个名词还是one of
1.This is one of the most interesting questions( that have been asked).
2.The only one of the actors (who knows the line well )is not here.从这两句结构相似的例句看来,第一句的先行词是questions,第二句的先行词是the only one,为什么?