GRE
Exam
Verbal Ability
One Word Substitution
Question
Each member of the journalistic pair served as ………………… the other: each refrained from publishing a given piece if the other doubted that it was ready to be printed.
(A) a check on
(B) an advocate for
(C) an impediment to
(D) a brake on
(E) an apologist for
(F) an intermediary for
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