求助BY上的一道题

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

答案是E，可是给D的解释是“so much...as to be difficult to absorb属于累赘，笨拙的表达方式，永远错”。这不是跟OG上的arkward,redundant的模糊的评价差不多了吗，具体awkard在哪里，谁能给出解释，谢谢。

没有人会吗，自己顶一下。

哎,没人会吗