国家开放大学 / 理工英语3
— How long is this cell phone guaranteed?
— _ _ _ _ _ _
A. You can refund it in 7 days and exchange it in one year.
B. No problem.
C. Don't mention it.
— _ _ _ _ _ _
A. You can refund it in 7 days and exchange it in one year.
B. No problem.
C. Don't mention it.
参考答案：