23 The audience is required to keep absolutely silent while the band is _____ on stage.
(A) boycotting
(B) graduating
(C) performing
(D) scratching
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統計: A(151), B(241), C(944), D(117), E(0) #2782334
統計: A(151), B(241), C(944), D(117), E(0) #2782334