You cannot cancel your order______you change your mind within three days.

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问题 You cannot cancel your order______you change your mind within three days.

选项 A、as if
B、while
C、so that
D、unless

答案D

解析本题考查连词意义及用法。主句为“你不能取消订单”，从句意为“三天之内改变主意”，D项unless意为“除非”，引导条件状语从句，符合句子语境。

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大学英语三级B级

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