再问一次，两道题的比较，大全214 &OG 118请诸位不吝赐教！！！

OG118.
        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

214       
Climatic shifts are so gradual as to be
indistinguishable at first from ordinary fluctuations in the weather.

(A) so gradual as to be
indistinguishable

(B) so gradual they can be
indistinguishable

(C) so gradual that they are unable
to be distinguished

(D) gradual enough not to be
distinguishable（A）

(E) gradual enough so that one
cannot distinguish them

#1首先，so/such ...as to 一般情况下逻辑主语缺省的是主句的主语，在次是与so/such.. as to离得最近的宾语,这道题 students 不能sbsorb them吧？即使可以也得用themselves.所以A不对

#2 so..that 基本结构 B错

unable to be distinguished 错    C错

enough so that..错  E错

D中的话表达没有A好，因为否定词的位置变化，造成了强调结果的变化。