Shanghai is trying to control ________ number of cars on the road to ensure clean air for ________ 2010 World Expo.

A. a ; /　　　　　　　　 B. a ; the　　　　　 C. the ; /　　　　　 D. the ; the

Shanghai is trying to control ________ number of cars on the road to ensure clean air for ________ 2010

  World Expo.

  A. a ; /               B. a ; the               C. the ; /                D. the ; the

.

. Shanghai is trying to control ________ number of cars on the road to ensure clean air for

________ 2010 World Expo.

A. a ; /                                B. a ; the                      C. the ; /                       D. the ; the

.
. Shanghai is trying to control ________ number of cars on the road to ensure clean air for
________ 2010 World Expo.