prep 上的一道题

xiao_s000

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

Boot

这道题在群里讨论过了
twice as many as属于同位语，必须紧跟前面的number，所以错。
doubling做伴随可以修饰主句的主语，也可以修饰整个主句。
而increase in xxx，表示xxx本身增加；the increase of TIME PERIOD表示这段时间内的增长

xiao_s000

thanks