阿摩線上測驗
49. With the increasing oil price, many frequent flyers feel helpless about leaving themselves ________ to price rises in the airline industry.
(A) vulnerable
(B) responsive
(C) sensitive
(D) irreversible
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統計： A(1), B(1), C(0), D(0), E(0) #3361971
統計： A(1), B(1), C(0), D(0), E(0) #3361971
