2. 外语
  3. To better serve our customers, we guarantee that all the products in our store are refundable,______opened or unopened.

To better serve our customers, we guarantee that all the products in our store are refundable,______opened or unopened.

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问题 To better serve our customers, we guarantee that all the products in our store are refundable,______opened or unopened.
选项 A、neither
B、whether
C、unless
D、besides
答案B
解析 语法：连词1．选项由连词和副词构成。空格后出现or，因此(A)选项neither排除。副词neither可与连词nor搭配使用，但不符合题意。2．(D)选项besides可作介词和副词，但不可作连词。(C)选项unless有连词功能但与文意不符。3． whether the products are opened or unopened省略了主语和be动词，因此(B)为正确选项。
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