题目内容
【题目】A nature reserve for white-flag dolphins was set up in 1992, ________ boats have been prohibited from sailing around since then.
A. where B. which C. when D. what
【答案】A
【解析】考查定语从句中关系副词的用法。观察句子,可知本句是含有定语从句的主从复合句。根据定语从句的内容“自从那时起,船只被禁止在周围航行”可知被修饰的先行词是A nature reserve,定语从句中缺少地点状语,故应选A。