阿摩線上測驗
31.We enclose our credit note No.C35for$15.75,which is a＿＿＿for the overcharge on invoice No.A321.
(A)bonus
(B)balance
(C)refund
(D)debt。
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統計： A(2), B(1), C(14), D(1), E(0) #3466314
統計： A(2), B(1), C(14), D(1), E(0) #3466314
