there are many people wandering in this city to see the old castles built in the sixteenth century.

问题描述:

there are many people wandering in this city to see the old castles built in the sixteenth century.
请问在castles后为什么不用被动语was built而只用built,是不是省略了什么?

没有省略,这是过去分词短语作后置定语.即built放在名词castles的后面修饰限定它.