She showed the visitors around the museum, the construction had taken more than three yea

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A. for which
B. with which
(答案→)C. of which
D. to which
解析：考查定语从句。本题的先行词是the museum,介词of 表示属于关系，which指代先行词在句中做of的宾语。句意：她带领着游客们参观了博物馆，博物馆的建设已经花了三年多的时间了。故C正确。