答案D的确不错

可是C哪里不对呢？

40: GWD-29-Q29

Most of Portugal’s 250,000 university students boycotted classes in a one-day strike to protest a law that requires them to contribute $330 a
            year toward the cost of higher education, previously paying $7 per year.

1. year toward the cost of higher education, previously paying $7 per year
2. year toward the cost of higher education, for which was previously paid $7 per year
3. year, compared to the previously $7 per year, toward the cost of higher education

4. year toward the cost of higher education, instead of the $7 per year required previously

5. year as opposed to the $7 per year required previously for the cost of higher education

没人回答

自己顶一下吧

C中的previously不对,previously required.

instead of, compared to 都不太好，instead of好一点

个人感觉:

compared to...这个插入将toward...与前句隔得太远,非常不顺畅.如果是:

......to contribute $330 a
            year toward the cost of higher education, compared to the previously $7 per year.

就可以.

这题是争议题,答案在C,D之间,可以搜索相关连接 看看讨论

介词+which后面必须是完整的句子

b选项中，previously是副词，不可以修饰名词啦

而且compare to是“比喻”的意思，compare with 是“比较”的意思。不过即使改成compare with也不好，貌似gmat还没有这么用的正确答案呃