Customers should be aware that discounted products are not refundable,______opened or unopened.

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问题 Customers should be aware that discounted products are not refundable,______opened or unopened.

选项 A、neither
B、whether
C、unless
D、besides

答案B

解析语法：连词1．空格后接分词，应填入一个连词，所以A选项副词neither和D选项介词besides均排除2．空格内填入whether，和or连用，意为“或者……或者……”，因此(B)为正确选项。

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