I banning trucks in the city centre because it will reduce air pollution and noise.A. assi

问题补充：

I banning trucks in the city centre because it will reduce air pollution and noise.

A. assist

B. advocate

C. admit

D. oppose

答案：

A. assist

(答案→)B. advocate

C. admit

D. oppose

解析：句意:我支持禁止汽车在市中心通行这一主张,因为这样会减少空气污染和噪音。assist 帮助；协助，后接介词with/in；advocate拥护；支持，后可以接动词ing形式；admit 承认，后接动词ing形式；oppose反对，后接名词或代词，但be opposed to 后接 doing。根据题意，只有B项正确。