问题
选择题
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
答案：C
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。
