double和twice地用法

The number of people flying first class on domestic flights rose sharply in 1990, doubling the increase of the previous year. 

A. doubling the increase of

B. doubling that of the increase in

C. double as much as the increase of

D. twice as many as the increase in

E. twice as many as the increase of

  NN求解。答案是A

  NN求解。答案是A

sth double sth;   sth is doubled;

twice as many/much...as;   twice + the + n. ;   twice + what从句

此题B选项的 that 代替了 the number, 其他选项的increase 不能代替 the number