阿摩線上測驗
101. Visitors are required to present valid identification _______ the security desk before entering the research facility.
(A) on
(B) at
(C) to
(D) with
答案：登入後查看
統計： A(43), B(55), C(55), D(6), E(0) #3805109
統計： A(43), B(55), C(55), D(6), E(0) #3805109
