The Liberty Bell, formerly housed in Independence Hall, ________ in Philadelphia, was moved to a separate glass pavilion in 1976．A.which a historic buildingB.a historic building whichC.was a historic buildingD.a historic building
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D解析句子有完整的主谓宾，空格部分成分是主语的同位语，A、B项从句少谓语；C项后边已经有谓语了，此处又没有从句引导词，was多余。