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The road constant improvements can't keep pace with the increasing ____ .

A. trucks               B. private cars             C. buses                     D. traffic

278. The road constant improvements can’t keep pace with the increasing ____ .

A. trucks                      B. private cars             C. buses                     D. Traffic

The road constant improvements can’t keep pace with the increasing ____ .

A. trucks　 B. private cars　 C. buses　　 D. traffic

278. The road constant improvements can’t keep pace with the increasing ____ .