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she showed her visitors around the museum ,the construction

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she showed her visitors around the museum ,the construction of which has taken more than three years 为什么要用of which
she showed her visitors around the museum ,the construction
她带着游客在博物馆参观,这个博物馆用了三年多的时间才建好.
用of which是因为在这种非限制性定语从句中,which指代前面的博物馆,这个句子也可以写成she showed her visitors around the museum .the construction of it/the museum has taken more than three years 但是要把逗号变成句号.而文中的of which就是指代前面的先行词museum.
另外这种类型的定语从句的连接词只能用which,因为其中有表示所属关系的介词of