The city had once known __ A.a prosperity B.the prosperous C.the prosperity D.prosperity

The city had once known __ A.a prosperity B.the prosperous C.the prosperity D.prosperity
The city had once known __ A.a prosperity B.the prosperous C.the prosperity D.prosperity

The city had once known __ A.a prosperity B.the prosperous C.the prosperity D.prosperity
选D.prosperity“繁荣”,可以直接作主补
A.prosperity是不可数名词 ,加a错误
B.prosperous 是形容词,但它的后面缺少被修饰的名词或代词
C.prosperity没有必要用the去限定为“那繁荣”

选D没错， 但在这里应该把known看成形容词，翻译成知名的
这个城市曾经有过知名的繁荣度。这个城市曾经出名的繁华。
希望对你有用！

选D