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

這題考查prove做連系動詞的用法，意思是：”證明是”后面可以接adj/n做表語，句意是：如果我們的產(chǎn)品7天之內(nèi)內(nèi)證明是不滿意的，你可以退貨。選B。
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