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】

试题分析：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 for white－flag dolphins ，是地点名词，定语从句中缺少状语，故应用关系副词引导定语从句，所以答案选A。