阿摩線上測驗
107. Passengers are reminded to keep their seatbelts fastened_______the captain turns off the safety sign.
(A) as if
(B) unless
(C) without
(D) regarding
答案：登入後查看
統計： A(47), B(188), C(40), D(27), E(0) #3823407
統計： A(47), B(188), C(40), D(27), E(0) #3823407
