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
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統計： A(435), B(111), C(25), D(58), E(0) #3782037
統計： A(435), B(111), C(25), D(58), E(0) #3782037
