赞题库-背景图
单项选择题

You are now the proud owner of a Dustfree vacuum cleaner. This product will provide you with years of ______ service and quality performance. We offer you a lifetime guarantee ______ any defects in material and workmanship.
If you do experience any of these problems with your product we will fix the machine at no cost to you or we will provide you with a new product at no additional charge. Please visit our Web site and give us your mailing address and a short description of the problem. We will then have a service representative ______ the cleaner at your convenience. However, we do not cover willful or accidental damages.

A. against
B. at
C. during
D. until