21 Sitting through a long presentation can make audience ___, so speakers should limit their talks to 30 minutes.
(A)affordable
(B)excessive
(C)remarkable
(D)restless
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統計: A(16), B(14), C(9), D(57), E(0) #867350
統計: A(16), B(14), C(9), D(57), E(0) #867350