阿摩線上測驗
22. What problems are you ___________ with your current periodical maintenance system?
(A) have experienced
(B) experiencing
(C) will experience
(D) will have experienced
答案：登入後查看
統計： A(309), B(711), C(100), D(70), E(0) #2333280
統計： A(309), B(711), C(100), D(70), E(0) #2333280
