单选题 As the old empires were broken up and new states were formed, new official tongues began to ______ at an increasing rate.
A. bring up B. build up C. spring up D. strike up

【正确答案】 C
【答案解析】[解析] bring up意为“教育，养育”；build up意为“逐步建立，增强”；spring up意为“迅速成长”；strike up意为“开始(交谈)”。