London is city in the USA(改错)

问题描述:

London is city in the USA(改错)

london is not the city in the USA

'is a city', 少了不定冠词 'a'.
我是老师, 欢迎来问.
楼上, 美国有个城市叫 London.
如果按楼上的改法, 还要改成 'London is not a city' 也要'a'.

London is a city in the UK