【正确答案】:
IN A WORD, IT IS TO BUILD CHINA INTO A PROSPEROUS, STRONG, DEMOCRATIC AND CULTURALLY ADVANCED MODERN COUNTRY. 
【题目解析】:原译文的句子缺少主语,改译句中“it”的添加使得句子结构完整。
IN A WORD, IT IS TO BUILD CHINA INTO A PROSPEROUS, STRONG, DEMOCRATIC AND CULTURALLY ADVANCED MODERN COUNTRY.