問題詳情

【題組】6. After the terrorist attack, the airline took steps to ______ the safety of its passengers at all times.
(A) assure
(B) ensure
(C) recruit
(D) insist

參考答案

答案：B[無官方正解]
難度：適中0.5
統計：A(0),B(6),C(1),D(0),E(0)