The price in different countries will be based and local economic conditions.
A. in advance
B. in conclusion
C. on demand
D. at all costs
网友回答
A. in advance
B. in conclusion
(答案→)C. on demand
D. at all costs
解析：句意：不同国家的价格将以需要为基础和当地的经济条件。in advance提前；in conclusion总之；at all costs无论如何。根据句意故选C。