The Big Ben we visited during a recent trip to Britain is one of London’s tourist attra

问题补充：

The Big Ben, we visited during a recent trip to Britain, is one of London’s tourist attractions.

A. which

B. what

C. that

D. where

答案：

(答案→)A. which

B. what

C. that

D. where

解析：这是非限制性定语从句，先行词是The Big Ben，定语从句中缺少宾语，where不能作宾语，故排除D； what不能引导定语从句；that不能引导非限制性定语从句，故选A.