题目：
Having finished lunch, the case was discussed.
A．they discussed the case
B．they had discussed the case
C．the case was discussed
D．the case had been discussed
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析：本题考查作业排序的定义。作业排序是指为每台设备、每位员工具体确定每天的工作任务和工作顺序的过程。
