問題詳情

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

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)