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

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.

1. A.
   prepared; built; covered
2. B.
   preparing; built; and covered
3. C.
   which prepares; building; covers
4. D.
   preparing; built; covering