It is said that this project will take two to three years, and cost about 200 million yuan.
A. mainly
B. regularly
C. approximately
D. frequently
网友回答
A. mainly
B. regularly
(答案→)C. approximately
D. frequently
解析：考查副词：A. mainly主要的B. regularly有规律地C. approximately 大约D. frequently频繁地，句意：据说，这个项目大约要两到三年，耗费2亿。选C。