the number of girls receving collage education has doubled in the country during the past 10 years

在过去的十年里,这个国家接受大学教育的女孩子的数目翻了一倍.

这里的doubled是双倍的意思
而用HAS是代表结果
看看后面的during the past 10 years

而得到语态应该是用现在完成时.

"has doubled" is a "Present Perfect Tense," it describes an action that happened at an indefinite time in the past or that began in the past and continues in the present. This tense is formed by using "has/have" with the "past participle" of the verb.

e.g: Women have voted in presidential elections since 1921 in the
United States.

那是个动词“变成两倍”的意思，后面有时间限制的嘛！