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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