46. The phrase "These ubiquitous bus pioneers" in lines 17-18 refers to
(A) Americans who could not afford cars
(B) car owners who preferred toleave distance driving to others
(C) individuals attracted to the intercity bus industry
(D) fare-paying passengers
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統計: A(12), B(16), C(56), D(17), E(0) #801569
統計: A(12), B(16), C(56), D(17), E(0) #801569