阿摩線上測驗
18. It is hard to say which mode of transport is the most_______ because prices vary widely for both train trips and flights according to many factors, such as dates or classes of services.
(A) competent
(B) original
(C) resourceful
(D) economical
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統計： A(2), B(1), C(0), D(15), E(0) #3356764
統計： A(2), B(1), C(0), D(15), E(0) #3356764
