阿摩線上測驗
31. We made ______ to the practices of other companies when developing our procedures.
(A) refer
(B) referral
(C) referring
(D) reference
答案：登入後查看
統計： A(8), B(1), C(7), D(13), E(0) #3887978
統計： A(8), B(1), C(7), D(13), E(0) #3887978
