阿摩線上測驗
2. The professor's sophisticated lecture was so ________ that even the most diligent students struggled to grasp the core concepts.
(A) lucid
(B) abstruse
(C) lachrymose
(D) mundane
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統計： A(1), B(26), C(3), D(0), E(0) #3868469
統計： A(1), B(26), C(3), D(0), E(0) #3868469
