阿摩線上測驗
22. Dr. Smith _____ treating teenage acne, so I’m sure she will be able to help you out.
(A) knows
(B) proficient as
(C) studies with
(D) specializes in
答案：登入後查看
統計： A(4), B(32), C(36), D(296), E(0) #1835484
統計： A(4), B(32), C(36), D(296), E(0) #1835484
