单选题:工作A的工作持续时间为5天,该工作有三项紧后工作,工作持续时间分别为6天,4天、8天;最迟完成时间分别为19天、l6天、

题目内容:
工作A的工作持续时间为5天,该工作有三项紧后工作,工作持续时间分别为6天,4天、8天;最迟完成时间分别为19天、l6天、l5天,则工作A的最迟开始时间为第(  )天。 A.2
B.3
C.7
D.12

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