某软件项目的活动图如下图所示，其中顶点表示项目里程碑，连接顶点的边表示包含的活动，边上的数字表示活动的持续时间（天）。完成该项目的最少时间为（ ）。由于某种原因，现在需要同一个开发人员完成BC和BD，到完成该项目如最少时间为（ ）天。
问题1选项
A.11
B.18
C.20
D.21
问题2选项
A.11
B.18
C.20
D.21
正确答案及解析
正确答案
解析
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