阿摩線上測驗
37. If you don’t understand the instructions, please don’t hesitate ________ a question.
(A) to ask
(B) asking
(C) ask
(D) to asking
答案：登入後查看
統計： A(87), B(20), C(5), D(7), E(0) #2077931
統計： A(87), B(20), C(5), D(7), E(0) #2077931
