阿摩線上測驗
5. The station was closed for system ________.
(A) improvement
(B) maintenance
(C) pollution
(D) entertainment
答案：登入後查看
統計： A(5), B(33), C(2), D(2), E(0) #3492413
統計： A(5), B(33), C(2), D(2), E(0) #3492413
