China’s economic development has made rapid progress in the past 20 years and young peopl

问题补充：

China’s economic development has made rapid progress in the past 20 years and young people have made great contribution to this progress.

A. /; a

B. the; a

C. a; a

D. /; /

答案：

(答案→)A. /; a

B. the; a

C. a; a

D. /; /

解析：考查冠词。make rapid progress取得迅速的进步；make a great contribution to做出巨大的贡献。根据句意选A。