阿摩線上測驗
31. To apologize for the flight delay, the airline company gave each of the passengers a $400 ________ as a token of its goodwill.
(A) example
(B) mark
(C) sample
(D) voucher
答案：登入後查看
統計： A(0), B(0), C(0), D(1), E(0) #3361953
統計： A(0), B(0), C(0), D(1), E(0) #3361953
