The Princess and the Frog is a fairy musical that the days when Walt Disney was a person, not a brand.
A. was dated back to B has been dating from C dates back to D had dated from
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解析：考查时态。本题考查短语date back to/from追溯到，无被动语态，一般用一般现在时。句意：《王子与青蛙》是一个童话音乐剧，追溯到那时华特迪士尼是一个人，而不是一个品牌。故C正确。