阿摩線上測驗
14. Facebook apologized for letting advertisers ___________ improper phrases and not noticing them.
(A) to use
(B) use
(C) using
(D) used
答案：登入後查看
統計： A(9), B(32), C(16), D(5), E(0) #1719883
統計： A(9), B(32), C(16), D(5), E(0) #1719883
