After the new technique was introduced the factory produced tractors in 1988 as the year

问题补充：

After the new technique was introduced，the factory produced tractors in 1988 as the year before.

A. as twice many

B. as many twice

C. twice as many

D. twice many as

答案：

A. as twice many

B. as many twice

(答案→)C. twice as many

D. twice many as

解析：这题考查倍数的表达：倍数+as+adj+as，tractors是可数名词，用many修饰。句意是：在新技术引进后，工厂1988年生产的拖拉机是前一年的两倍。选C。