33. When the official fired the starting gun, all the ________ in the race took off running.
(A)motorists
(B)participants
(C)pedestrians
(D)passengers
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統計: A(21), B(196), C(42), D(39), E(0) #2130436
統計: A(21), B(196), C(42), D(39), E(0) #2130436