My favorite article is I wrote about 下面写 A that B one C what D whichMy favorite article is I wrote about the efforts to bring stolen cultural relics back to China为什么 不能用 whatMy favorite article is [（w
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从语法的角度讲选 what 没有问题,但从语义和选择最佳答案的角度讲,one 更好些,favorite 对 one 更工整些.
My favorite article is what I wrote about the efforts to bring stolen cultural relics back to China.
我最喜爱的文章是我写的关于将被盗的文化遗存带回中国的行动.
My favorite article is one I wrote about the efforts to bring stolen cultural relics back to China.
我最喜爱的文章是我写的【一篇】关于将被盗的文化遗存带回中国的行动.
======以下答案可供参考======
供参考答案1:
要用where