Question

【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

Answer 1

【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。