阿摩線上測驗
105. Customers who wish to return a defective product must present a valid receipt as________of purchase.
(A) proof
(B) prove
(C) proves
(D) proven
答案：登入後查看
統計： A(488), B(122), C(28), D(63), E(0) #3782037
統計： A(488), B(122), C(28), D(63), E(0) #3782037
