单选题 To: Customer Services＜customerservices@jpelectronics.com＞
From: Harrison Davis＜hdavis@caum.com＞
Date: May 10
Re: Microwave Oven
To whom it may concern,
I am writing to see if you are able to give me some information on how to ______ a microwave oven.
I have had model HW 100 for two years, and ______ last week, it worked fine.
I thought there was a problem with the power cord, so I changed it with a new one. ______, it does still not work. It is clear that the oven malfunctions due to the mechanical defect. As there is still one year remaining in the coverage period, I"d like to have my oven repaired free of charge.
There is no authorized service center for the HW 100 model in my area. Please let me know what I can do about it.
Thank you for your assistance.
Harrison Davis
【正确答案】 A
【答案解析】[解析] 词汇：动词
1．这是一道词汇题，选项均为动词。
2．选项中的四个动词都可修饰空格后的宾语(a microwave oven)，但原文意思是“上周还可以使用，但从这周开始就不可以了”，可以判断是出了故障，因此A．repair为正确选项。
【正确答案】 D
【答案解析】[解析] 词汇：介词
1．空格后没有出现句子，因此连词unless排除，还剩下三个介词选项(after、by、until)。
2．原文意思是“型号为HW100已经使用两年了，直到上周开始出现故障”，因此D为正确选项。
【正确答案】 B
【答案解析】[解析] 词汇：副词
1．前文中提到“更换了电源线，但还是不能正常使用”，因此B．however为正确选项。
2．however不是介词而是连词，可以连接前后文。