The number of vehicles on the road classified as "light trucks" in the United States increased by more than twice from 1980 to 1992.
A.increased by more than twice
B. increased more than two times
C.more than doubled
D.was more than doubled
E. had more than doubled
表示不明白B选项为什么不选
还有正确答案C more than 是做副词修饰double吗??看不懂这个比较结构 求大神分析