The Summer Palace is one of the most beautiful parks ________ built in the Qing Dynasty．

1. A.
   where were
2. B.
   where was
3. C.
   that were
4. D.
   which was

The Summer Palace is one of the most beautiful parks ______ built in the Qing Dynasty.
A where were B where was 　 　 　 C that were 　 　 　 D which was