Foreign visitors will be amazed ______ the art work of three cowboys on horseback ______ a crowd of cows back home along a road on the Rocky Mountains on one broad maple leaf.

1. A.
   seeing; driving
2. B.
   to see; to drive
3. C.
   to see; driving
4. D.
   seeing; to drive

Foreign visitors will be amazed ______ the art work of three cowboys on horseback ______ a crowd of cows back home along a road on the Rocky Mountains on one broad maple leaf.

　 A. seeing; driving 　 B. to see; to drive　 　 C. to see; driving　 　 D. seeing; to drive