請教OG#103(第10版)

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 ----such ....as to ...可以吗？我记得好象只可以用so ...as to.不能such...as to呀? 请NN指正. 而且我想问的是这里it指代清楚吗?是指代后面的to不定式 to absort them into....吗?

(B) lack math skills to a large enough degree that they will be difficult to absorb into a city’s economy that becomes   ---enough...that对吗? that从句中的they will be difficult to absorb不对吧?应该是 to be absorbed吧?因为这里主语是students.

(C) lack of math skills is so large as to be difficult to absorb them into a city’s economy that becomes  ----lack是名词,句子fragment

(D) are lacking so much in math skills as to be difficult to absorb into a city’s economy becoming ---逻辑上好象成了students 是absorb的主语.

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

请指教.谢谢.

up.

这道题还真是有点混乱，哪位nn指点迷津？