when 引导的定语从句中,如果先行词表示时间的概念已经相当明确,省略关系副词when.
英语牛人团为你解答,不懂追问可以举些相关的可以省略连词的句子么During the while he was waiting, he kept looking at his watch.In those years he worked there, he was anxious to find a chance to work for a better boss.