sth is so X as to Y 与 sth is so X that Y

1. sure.
Climate shift are so gradual as to be indistinguishable at first from ordinary fluctuation in the weather.
2. right. but there're other factors we need to consider when choose which structure to use.

51. A new study suggests that the conversational pace of
everyday life may be so brisk it hampers the ability of
some children for distinguishing discrete sounds and
words and, the result is, to make sense of speech.
(A) it hampers the ability of some children for
distinguishing discrete sounds and words and,
the result is, to make
(B) that it hampers the ability of some children to
distinguish discrete sounds and words and, as a
result, to make （正确）
(C) that it hampers the ability of some children to
distinguish discrete sounds and words and, the
result of this, they are unable to make
(D) that it hampers the ability of some children to
distinguish discrete sounds and words, and
results in not making
(E) as to hamper the ability of some children for
distinguishing discrete sounds and words,
resulting in being unable to make

OG E项的解释："the phrase is awkward, wordy, and unclear; for is the incorrect preposition to follow ability."
请教大班，是不是GMAT并不认可 so...as to...的使用，尤其是与so...that...结构相比？
谢谢！