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Verbal·Craft and Structure·Words in Context
hard
       though it seemed to many mathematicians, the Marden tameness conjecture, posed in 1974, eventually yielded to the efforts of Ian Agol, who presented a proof of it in 2004.
Which choice completes the text with the most logical and precise word or phrase?
A
Insuperable
B
Unequivocal
C
Irreproachable
D
Ineluctable