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【单选题】
— 在某工程网络计划中,已知工作 M 的总时差和自由时差分别为5 天和 4 天,监理工程师检查实际进度时,发现该工作的持续时间延长了7 天,说明此时工作 M 的实际进度将其紧后工作的最早开始时间推迟 ( ) 。
A.
7 天，但不影响总工期
B.
5天，但不影响总工期
C.
3 天，并使总工期延长2 天
D.
4 天，并使总工期延长 2 天
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