1)定语从句的先行词通常是这个“复数名词”,因此从句的谓语用复数形式。e.g.
①This is one of the best novels that have appeared this year . 这是今年出版的最佳小说之一。(关系词“that”代“novels”)
②He was one of the boys who were praised . 他是受表扬的男孩之一。
2)若“one”前加“this, the ,the only ”等时,定语从句的关系词指代one,作从句主语时,接单数谓语。e.g.
He was the only one of the boys who was praised .他是男孩中唯一受到表扬的。(关系词who 代 the only one )