题目内容：
根据听到的内容，回答题。When a consumer finds that his purchase has a fault in it, what is the first thing he should do?
A．Complain personally to the manage B．Threaten to take the matter to cour
C．Write a firm letter of complaint to the store of purchas
D．Show some written proof of the purchase to the stor
参考答案：
答案解析：