P216

bongrim

141.
                In the last ten years, the dropout rate among Black high school students fell substantially over the past decade, while the number of Blacks who attend college is more than twice what it was.

(A) fell substantially over the past decade, while the number of Blacks who attend college is more than twice what it was

(B) fell substantially, while the number of Blacks attending college is more than double what it was at that time

(C) has fallen substantially, while the number of Blacks attending college has more than doubled

(D) has fallen substantially over the past decade, while the number of Blacks attending college is more than twice what it was at that time（C）

(E) has fallen substantially over the past decade, while the number of Blacks who are attending college are more than double what they were

大全答案是C，而蓝皮书答案是E      正确答案是哪个？

B 为什么错？

houjian517

C 

over the past decade  与 in the past ten years 重复   排除 A D E

in the past ten years 用完成时态  排除B

另外

动名次attending 优于 定于从句 who attend

double 可以用于动词   同时事态为完成时 所以用 has more than doubled

the number of 用单数