8. The scientist's explanation was so _______ that even the most seasoned researchers struggled to grasp the concept, leading to a prolonged debate in the academic community.
(A) lucid
(B) abstruse
(C) mundane
(D) cogent
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統計: A(2), B(10), C(0), D(0), E(0) #3449351
統計: A(2), B(10), C(0), D(0), E(0) #3449351