下列说法正确的是（ ）
- A.招标人对已发出的招标文件进行必要的澄清或者修改的，应当在招标文件要求提交投标文件截止时间至少20日前，以书面形式通知所有招标文件收受人
- B.招标人根据招标项目的具体情况，可以组织潜在投标人踏勘项目现场。
- C.招标人设有标底的，标底必须保密，但在特殊的情况下，可以公开标底。
- D.依法必须进行招标的项目，自招标文件开始发出之日起至投标人提交投标文件截止之日止，最短不得少于30日。
正确答案及解析
正确答案
解析
招标人对已发出的招标文件进行必要的澄清或者修改的，应当在招标文件要求提交投标文件截止时间至少十五日前，以书面形式通知所有招标文件收受人. 依法必须进行招标的项目，自招标文件开始发出之日起至投标人提交投标文件截止之日止，最短不得少于二十日。
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