Question

【题目】Visitors can see the large diamond, ______ has been kept at the Tower since the 17th century.

A. which B. that

C. what D. who

Answer 1

【答案】A

【解析】考查定语从句的用法。句意：参观者看到了巨大的钻石，这钻石自从17世纪以来一直保存在塔里。非限制性定语从句中缺少主语，先行词是diamond，应用which引导。故选A。