题型分类:细节题
题干分析:根据policy、refund定位到原文。
选项分析:根据refund定位,课本的退书期限是原文中的4 weeks after the beginning of semester对应选项B中的early in the school semester;
店员还说 The books have to been in perfect condition ...原文中的perfect condition 对应选项D中的new condition,所以正确答案是选项B和D
A 选项中的store credit确实在原文中出现过,但不是store policy
C选项时间错误
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