阿摩線上測驗
24. You will receive a confirmation email _____ your order is shipped.
(A) until
(B) once
(C) then
(D) unless
答案：登入後查看
統計： A(59), B(196), C(30), D(15), E(0) #3036952
統計： A(59), B(196), C(30), D(15), E(0) #3036952
