妹子求教一个世界级难题，比较状态什么时候要把that/those 补出来

maplestage

这种类型题目老是错 不知道两个东西比较什么时候把 that/ those of 补充出来  下面是一个困扰本学渣的经典例子

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
看见B 就情不自禁 就选了

ukyo2003

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

the number doubling the increase (increase=another number因为people不能increase，只有people的number才能increase)

Vanyazhao

第一句讲number但是double的是increase
补that是同种的
曼哈顿里讲过这个

yakev6

好久没来CD了，附上神器希望有帮助，打开ppt搜索关键词比较，你就都懂了。加油！

lainemai

that指代不清楚，而且相较于A，A会更加简洁有效，如果你认为that是the numeber,把B的That换成numer,那么就是doubling the number of the increase in the precous year,  the number of the increase一点都不make sense，而且很awkward

kiwifoodtown

如果补出that，但是that却无所指代，那么补出that便毫无意义，所以错。

benjaminsandro

整句话都在讨论数据，对比的也是人数。
that of the increase是“增长数的XXX”，显然跟人数不是一个层级。