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【单选题】
根据《招标投标法》的规定，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( )日前，以书面形式通知所有招标文件收受人。A.
5
B.
7
C.
10
D.
15
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