Our Internet shopping site guarantees a free delivery service within 24 hours if the order is received before noon _______your m

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问题 Our Internet shopping site guarantees a free delivery service within 24 hours if the order is received before noon _______your money back.

选项 A、if
B、nor
C、unless
D、or

答案D

解析所有选项都是连词，所以很难从语法上下手。句中说，“我们保证在24小时之内派送到货，否则退款”，这是广告中经常使用的表达方式。表示“保证……。否则退款”应该怎么说，不难想到吧?

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