阿摩線上測驗
17. Please feel free to drop in and see me. Let’s keep _____ touch.
(A) in
(B) on
(C) of
(D) off
答案：登入後查看
統計： A(391), B(65), C(11), D(4), E(0) #822402
統計： A(391), B(65), C(11), D(4), E(0) #822402
