53 ______ from talking when someone is giving a lecture on a stage.
(A) Refrain
(B) Ensure
(C) Avoid
(D) Presume
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統計: A(29), B(1), C(30), D(4), E(0) #1543318
統計: A(29), B(1), C(30), D(4), E(0) #1543318