摘要： China’s economic development has made rapid progress in the past 20 years and young people have made great contribution to this progress. A 不填,a B. the; 不填 C. a; a D. 不填; 不填
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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. /; /
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