the US had only 3 cities with more than a million residents中,with是什么成分啊?
问题描述：
the US had only 3 cities with more than a million residents中,with是什么成分啊?
答
with more than a million residents
介词短语作后置定语,修饰cities
句意：美国只有三个居民超过一百万的城市.