请教08语法笔记206，(GWD-13-30)

ashcroft · 发表于 2011-9-25 15:58:03

For the first time inthe modern era, non-Hispanic Whites are officially a minority in California, whichamounts to a little less than half the population of the state, down fromnearly three-quarters only a decade ago.
A. which amounts to a little less than half the population of the state,down from nearly three-quarters only a decade ago
B. which amounts to a little less than half the population of the state,down from a decade ago, when it was nearly three-quarters
C. and that amounts to a little less than half the population of the state,down from a decade ago, when they were nearly three-quarters
D. amounting to a littleless than half the population of the state, down from nearly three-quarters adecade ago (D)
E. amounting to a little less than half the population of the state, downfrom what it was a decade ago by nearly three-quarters
关于正确的D选项，解释中说：down from在这里是一个分句～我想问一下，那么这个down算是什么词性？动词？副词？还是介词？
另外有没有哪位NN有类似这种分句形式的例句可以分享一两个，谢谢！：）

请教08语法笔记206，(GWD-13-30)

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