climate

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climate

by phelps » Thu Aug 13, 2009 11:30 am
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
(E) gradual enough so that one cannot distinguish them

OA is A

I thought so as is wrong in GMAT
can anyone explain please

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Re: climate

by sk8ternite » Thu Aug 13, 2009 4:11 pm
phelps wrote: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
(E) gradual enough so that one cannot distinguish them

OA is A

I thought so as is wrong in GMAT
can anyone explain please

This test your knowledge of idioms. The idiom so X as to Y is correct.