阿摩線上測驗
43. Which of the following is NOT a challenge confronting advertising industry now?
(A) Fraud.
(B) Ad-blocking.
(C) Complicated structure.
(D) Advantages enjoyed by big companies.
答案：登入後查看
統計： A(0), B(2), C(18), D(9), E(0) #1272713
統計： A(0), B(2), C(18), D(9), E(0) #1272713
