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.
A.
year toward the cost of higher education, previously paying $7 per year
B.
year toward the cost of higher education, for which was previously paid $7 per year
C.
year, compared to the previously $7 per year, toward the cost of higher education
D.
year toward the cost of higher education, instead of the $7 per year required previously
E.
year as opposed to the $7 per year required previously for the cost of higher education 请教一下各位高人，答案为什么是D呢？B错在哪里呢？which指代cost不行吗？ | 
