2002.8--30

30. Of all the art-related reference and research library in North America, that of the Metropolitan Museum of a Art in New York City is among the largest and most complete.

答案是A， library应该用复数形式。但怎么感觉整个句子不完整啊？“...among the largest and most complete”,这是什么句式结构？

有道理，谢谢楼上！