题目

（本题10分）某商场销售一批名牌衬衫，平均每天可售出20件，每件盈利45元，为了扩大销售、增加盈利，尽快减少库存，商场决定采取适当的降价措施，经调查发现，如果每件衬衫每降价1元。商场平均每天可多售出4件，若商场平均每天盈利2100元，每件衬衫应降价多少元？ 答案：解：设每件降价元，根据题意得解得∵尽快减少库存，所以答若商场平均每天盈利2100元，每件衬衫应降价30元解析:略It was not until she had arrived home _______ her appointment with the doctor. A．when she remembered B．and she rememberedC．did she remember D．that she remembered