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 as

C. as twice as many

D. twice as many

答案：

A. as twice many

B. as many as

C. as twice as many

(答案→)D. twice as many

解析：考查倍数表达法。倍数表达法：倍数+as形容词/副词原级as…倍数一直放在as的前面。本题的many修饰cars。句意：在新的技术被引进以后，这家工厂生产的汽车是以前的2倍。故D正确。