（单选题）
The（）defines the phases that connect the beginning of a project to its end.
Aschedule
Bproject life cycle
Ctemporary
Dmilestone
正确答案
答案解析
该题的关键词为"phases"，其语句结构为"______（主语）defines（谓语）the phases"，含义为"什么定义了项目的多个阶段"，通过筛选首先排除A和C，选项D也容易排除，因为Milestone（里程碑）只是关键点上发生的活动，不具备阶段的持续性特点，因而只能选择选项B。
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