摘要任务的开始时间取决于最早开始的（）

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【单选题】【消耗次数：1】

摘要任务的开始时间取决于最早开始的（）

① 子任务的开始时间

② 周期性任务的开始时间

③ 里程碑任务的开始时间

④ 项目的开始时间

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