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【单选题】
● 已知某工程网络计划中工作 M 的自由时差为 3 天，总时差为 5 天。监理工程师在检查进度时发现该工作的实际进度拖延，且影响工程总工期 1 天。在其他工作均正常的前提下，工作 M 的实际进度比计划进度拖延了（52）天。 （52）A.
3
B.
4
C.
5
D.
6
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