问题补充：
After the new technique was introduced，the factory produced in 2001 as the year before．
A. as twice many machines
B. twice many as machines
C. as many machines twice
D. twice as many machines
答案：
(答案→)A. as twice many machines
B. twice many as machines
C. as many machines twice
D. twice as many machines
解析：考查倍数表达。倍数表达的基本结构：
1. “A+倍数+形容词或副词的比较级+than+B”，表示“A比B大（长、高、宽等）多少倍”。
2.“A+倍数+as+形容词或副词的原级+as+B”，表示“A正好是B的多少倍”。
3. “A+倍数+the size/height/length/width， etc+of+B”，表示“A正好是B的多少倍”。
4. “……times+what+从句”。
可知选项BCD结构错误，故选A。
