Beijing, for hosting the 2008 Olympic Games, its first loop (圈) of green belt around the downtown, an area of 102.3 square kilometers, in the past three years.
A. prepared; built; covered
B. preparing; built; and covered
C. which prepares; building; covers
D. preparing; built; covering
网友回答
A. prepared; built; covered
B. preparing; built; and covered
C. which prepares; building; covers
(答案→)D. preparing; built; covering
解析：本题易误选A，B。preparing for作状语；built为谓语动词；covering an area of 102.3 square kilometers作green belt的定语。