请教一道语法题

sandy821130

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
正确答案是A，那什么时候应该用double，什么时候用twice呢，搞不清啊~~~

hottyfood

这道题的问题不是twice而是many吧。因为incresae是不可数的。C double 错，和as much as 搭配的用法错。 B的话that of没有指代对象。
这里改成 v+ing twice as great as the increase of 也应该对的吧。
由于水平有限，希望自己没有胡说八道

然后就是Manhattan的Idiom里面有提到double 和twice的用法。

mute800

twice和double不构成谁对谁错吧，语法基本都是选double sth or twice sth