由OG103想到的

103. Students in the metropolitan school district lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming ever more dependent on information-based industries.

(A)  lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming

(B)   lack math skills to a large enough degree that they will be difficult to absorb into a city's economy that becomes

(C)   lack of math skills is so large as to be difficult to absorb them into a city's economy that becomes

(D)  are lacking so much in math skills as to be difficult to absorb into a city's economy becoming

(E)   are so lacking in math skills that it will be difficult to absorb them into a city economy becoming

1，我的问题就是开始大家问的那个：E中them的指代：

哦，看来自己可以否定自己了，刚刚看到了

155题有反例