By 2015,the population in this area is expected to double_____of 2007.
问题描述：
By 2015,the population in this area is expected to double_____of 2007.
A.that B.what
Jack won't drive us to the airport.He has ____to take us all.
A.too small a car B.a too small car
答
第一题选 A：double that of 中 that 指代前面的the population
第二题选 A： 此时too small a car 就相当于 so small a car
如果是such 的话就是 such a small car
你就记住就行了,这是固定用法.没什么好办法去解释,解释反而容易糊涂.