45. According to the passage, all of the following changed travel in America in the 1920's EXCEPT
(A) widespread ownership of cars
(B) improved roads
(C) innovations in public transport
(D) competition between trams and trolleys
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統計: A(18), B(22), C(12), D(51), E(0) #801568
統計: A(18), B(22), C(12), D(51), E(0) #801568