阿摩線上測驗
4. Please wear a mask throughout the class and leave the windows open for better ______ even with the air-conditioners on.
(A) penetration
(B) ventilation
(C) veneration
(D) prolongation
答案：登入後查看
統計： A(128), B(343), C(131), D(50), E(0) #2388429
統計： A(128), B(343), C(131), D(50), E(0) #2388429
