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【单选题】
某单代号网络计划中，工作M的最早开始时间是第8天，持续时间为5天，该工作有三项紧后工作，其最早开始时间分别为第l6天、第18天、第2l天，则工作M的自由时差是( )天。[2008年真题]
A.
3
B.
5
C.
8
D.
10
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