阿摩線上測驗
21. More than one thousand experienced staff members' daily _______ work has kept this six-star hotel in top condition.
(A) conference
(B) maintenance
(C) foundation
(D) investigation
答案：登入後查看
統計： A(1), B(0), C(1), D(0), E(0) #3361943
統計： A(1), B(0), C(1), D(0), E(0) #3361943
