阿摩線上測驗
112. We apologize for the inconvenience, but the elevator is currently out of _______ for scheduled maintenance.
(A) work
(B) operation
(C) function
(D) service
答案：登入後查看
統計： A(80), B(51), C(57), D(252), E(0) #3804670
統計： A(80), B(51), C(57), D(252), E(0) #3804670
