阿摩線上測驗
As airplane pilots fly for many long hours, they are ____________ for the safety of hundreds of people on board.
(A) understandable
(B) changeable
(C) believable
(D) responsible
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統計： A(14), B(22), C(67), D(334), E(0) #442032
統計： A(14), B(22), C(67), D(334), E(0) #442032
