He was only one of the candidates who was going to take the oral defense.
【正确答案】
1、正确答案:(who)was一were
【答案解析】解析:考查单复数。确定从句中动词单复数形式的关键是先行词,这句话的意思是他只不过是将参加辩护的候选人中的一个,先行词是the candidates,而不是one,所以定语从句的谓语动词要用复数were。但这句:He was the only one of the candidates who was going to take the oral defense.中,由于有定冠词the限制,先行词是one,则要用was,这是有无定冠词的区别。