【单选题】【消耗次数：1】
How stupid I have been! Why _______ I do that before?
①
don’t
②
didn’t
③
not
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随机题目
【单选题】
需求的产生与分析过程包括：（1）需求表达（2）需求确认（3）需求产生（4）技术要求（5）功能要求，他们按顺序依次是（ ）
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