Q30:
For the first time in the modern era, non-Hispanic Whites are officially a minority in California, which amounts to a little less than half the population of the state, down from nearly there-quarters only a decade ago.
- which amounts to a little less than half the population of the state, down from nearly three-quarters only a decade ago
- which amounts to a little less than half the population of the state, down from a decade ago, when it was nearly three-quarters
- 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
- amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago
- amounting to a little less than half the population of the state, down from what it was a decade ago by nearly three-quarters
这道题大家的公论是D, 可是我有一个问题不明白，就是原题干中有only, 为什麽要省略掉呢，似乎按照GMAT的原则如果副词不是特别有问题，不该省略的呀
