阿摩線上測驗
42. The pilot made the announcement that the plane could not leave the gate_________ all passengers were seated and security belts were fastened.
(A)unless
(B)because
(C)even though
(D)while
答案：登入後查看
統計： A(580), B(84), C(76), D(111), E(0) #2847772
統計： A(580), B(84), C(76), D(111), E(0) #2847772
