9. Soon the students became "immersed" in their work.
(A) overwhelmed
(B) totally absorbed
(C) lost
(D) obsessed
(E) bored
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統計: A(6), B(16), C(5), D(12), E(3) #1093371
統計: A(6), B(16), C(5), D(12), E(3) #1093371