阿摩線上測驗
13. Traveling by bus, ______ traveling by air, does provide travelers with a more affordable way to get around the country.
(A) while not as popular as
(B) when popular not than
(C) though not as popular with
(D) as not popular as
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統計： A(1), B(0), C(0), D(0), E(0) #3451317
統計： A(1), B(0), C(0), D(0), E(0) #3451317
