4. The professor’s explanation was so _________ and well-structured that even students completely unfamiliar with the topic could easily understand it.
(A) convoluted
(B) lucid
(C) arcane
(D) oblique
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統計: A(0), B(2), C(0), D(0), E(0) #3828462
統計: A(0), B(2), C(0), D(0), E(0) #3828462