问题：
[单选题]已知某写字楼工程双代号网络计划的计划工期等于计算工期，且工作F的完成节点为关键节点，则该工作（）。
A、为关键工作
B、自由时差小于总时差
C、自由时差为零
D、自由时差等于总时差
参考答案：
D
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