Transcendentalist wrote:
A GMAT CAT score is basedon not only the number of questions answered correctly but also their difficulty level.
(A) on not only the number of questions answered correctly but also their difficulty level
(B) not only on the number of questions answered correctly but also their difficulty level
(C) not only on the number of questions answered correctly but also their level of difficulty
(D) not only on the number of questions answered but also on their difficulty level
(E) on not only the number
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