活动的最早可能完成时间是：

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【单选题】【消耗次数：1】

活动的最早可能完成时间是：

① 该活动箭头事件的最早可能发生时间

② 该活动箭尾事件的最早可能发生时间

③ 该活动箭头事件的最迟必须发生时间

④ 该活动箭尾事件的最早可能发生时间加上活动所需时间

⑤ 以上都不是

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