問題詳情

7. As airplane pilots fly for many long hours, they are ____________ for the safety of hundreds ofpeople on board.
(A) understandable
(B) changeable
(C) believable
(D) responsible的

參考答案

答案：D
難度：適中0.581081
統計：A(2),B(5),C(17),D(43),E(0)