After the new machine was introduced, the factory produced in 2011 as the year before.
A. twice as many machines
B. twice many as machines
C. as twice many machines
D. as many machines twice
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(答案→)A. twice as many machines
B. twice many as machines
C. as twice many machines
D. as many machines twice
解析：考查倍数表达法。倍数表达法：倍数+as adj n as 结构；倍数永远放在最前面。本题的many修饰machines放在as…as之间。