单选题 If you write a letter to complain,

A、 ask what recipt numbers you should give
B、 say how you feel about the matter
C、 it is necessary to send receipt
D、 it is important to keep a record of what you say

【正确答案】 D

【答案解析】第三段讲写信投诉问题。作者强调“stick to the facts and keep copy of what you write”，并且“you should give any receipt numbers，but yon should not need to give receipts or other papers to prove yon bought the article"，故答案选D而不选C。