题目内容
（请给出正确答案）
[单选题]
—How long is this cell phone guaranteed?—()
A.No problem.
B.You can refund it in 7 days and exchange it in one year.
C.Don't mention it.
单选题，请选择你认为正确的答案：
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A)2
B)4
C)6
D)8
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第8题
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