Completed in 1891, in what was known as the Gilded Age , the building is now owned by a famous writer .
问:这是道语法填空题,in what was known as the Gilded Age此句中in后要填what,说是引导宾语从句,且在从句中作主语,我怎么看不出来是如何作的宾语从句,“in后+名词/代词”这不是介词短语作状语么,为什么却把它称为了宾语从句,能将句式具体分解说明一下吗?
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