3. Instead of waiting for a problem to occur in the classroom, teachers should be _____ by thinking of solutions beforehand.
(A) diagonal
(B) blustery
(C) proactive
(D) unseemly
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統計: A(39), B(15), C(397), D(13), E(0) #2368901
統計: A(39), B(15), C(397), D(13), E(0) #2368901