剑 4 Test 1 中小作文的范文中的一个问题

BillbrysonUID: 2490802

今天看 剑 4 Test 1 中小作文的范文， 有一句话始终不明白什么意思，请教各位：

However, those consisting of only one parent or a single adult had almost double this propotion of poor people, with 21% and 19% respectively.

这句话的谓语只是 had 吗？ 感觉好像和图表里给的信息不一样啊~~

有没有高手帮忙解答下阿

谢过了，先~

bubblesarahUID: 2529572

我怎么觉得是完成时啊？？？
double是作动词用吧~~~~这个才是谓语~~~

dengyuanzhouUID: 2138420

这里的doulbe是前位限定词，以下是朗文的解释

double 【predeterminer 】
twice as big, twice as much, or twice as many

double the amount/number/size etc
　We'll need double this amount for eight people.
　The value of the house is double what it was.
当然，这里double可以作动词，改为those have doubled the proportion