---The Bird's Nest, isn't it?
---Yes. It's we visited during our stay in Beijing.
A. where
B. what
C. when
D. That
网友回答
A. where
(答案→)B. what
C. when
D. That
解析：复合句名词性从句考点。what 引导表语从句并且在从句中充当visit 的宾语。很多学生选D, 误以为定语从句或者没有掌握that 的基本用法，that 在名词性从句中只能起连接作用不充当成分。