50. What can be inferred from this passage about interactive classrooms?
(A) They are generally effective even when not carefully planned.
(B) They require thoughtful planning and active management of student participation.
(C) They can improve learning outcomes by increasing student interaction.
(D) They mainly benefit students who are already confident in speaking.

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統計： A(1), B(12), C(3), D(1), E(0) #3895161