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If our product ____ unsatisfactory within 7 days in any way, you can take it back.
A.showsB.provesC.makesD.performs
B

这题考查prove做连系动词的用法,意思是:”证明是”后面可以接adj/n做表语,句意是:如果我们的产品7天之内内证明是不满意的,你可以退货。选B。
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