世界上最贵的是什么笔〔用英语翻译〕
问题描述：
世界上最贵的是什么笔〔用英语翻译〕
答
which kind of pens is the most expensive in the world?
答
What is the world's most expensive pen
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答
What pen is the most expensive in the world?
答
What is the most expensive pen in the world?