阿摩線上測驗
130. Train operators need to conduct regular safety checks on the tracks and trains _____ to prevent potential accidents.
(A) afterward
(B) later on
(C) formerly
(D) in advance
(A) afterward
(B) later on
(C) formerly
(D) in advance
答案：登入後查看
統計： A(25), B(11), C(53), D(149), E(0) #3085099
統計： A(25), B(11), C(53), D(149), E(0) #3085099
