第17题: [单项选择]We regret to inform you that the materials you ordered are ______. A. out of work B. out of reach C. out of stock D. out of practice 参考答案:C 答案解析:此题考查固定词组的用法。我们遗憾地通知你们,你们认购的材料缺货。out of stock意为“无货”;out of work。意为“失业”;out of reach意为“够不到”;out of pra