5.With the help of the new equipment,our factories produced ___ VCD players in 2000 as the year before.A.as many as twice B.twice more than C.as twice many D.twice as many选项是D理由，为什么选D倍数表达法：
甲 + 谓语+倍数+the +n.(size/ height/ length……)+of 乙
甲 + 谓语+倍数+as + adj. + as 乙
甲 + 谓语+adj. 比较级+than 乙+by+倍数
甲+ 谓语+倍数+adj. 比较级+than 乙
1).This room is twice the size of that one.
This room is twice as large as that one.
This room is once larger than that one.
2).This factory produced three times as many cars as they did 10 years ago.
3).He is older than I by 3 years.= He is 3 years older than I.