Not only polluted but crowded.
A. was the city,were the streets
B. the city was,were the streets
C. was the city,the streets were
D. the city was,the streets were
网友回答
A. was the city,were the streets
B. the city was,were the streets
(答案→)C. was the city,the streets were
D. the city was,the streets were
解析：本题考查倒装结构。not only … but also…结构，not only部分主谓倒装，but also部分不倒装，故选C。