GWD13 Q30

ssxxtt27

For the first time in the modern era,non-Hispanic Whites are officially a minority in California,amounting to a little less than half the population of the state,down from what it was a decade ago by early three-quaters
这是个错误选项 解释说it无指代对象且用人数和年代对比错误。我的问题是：it指代population不行吗？a decade ago是状语，这样恰好是人数和人数比，哪里不妥？

soha111

同问！
为什么it会指代不清呢？
upup！！

zhuyinwei

同问！