by high mountains the city is infamous for air pollution. A. Surrounding B. To be surro

问题补充：

by high mountains, the city is infamous for air pollution.

A. Surrounding

B. To be surrounded

C. Surrounded

D. Having surrounded

答案：

A. Surrounding

B. To be surrounded

(答案→)C. Surrounded

D. Having surrounded

解析：考查非谓语动词。be surrounded by被……包围，在句中作状语，相当于The city is surrounded by high mountains。句意：被高山所包围，这座城市以空气污染而闻名。根据句意说明C正确。