单选题：肖群一周工作五天，除非这周内有法定休假日。除了周五在志愿者协会，其余四天肖群都在大平保险公司上班。上周没有法定休假日。因

题目内容：

肖群一周工作五天，除非这周内有法定休假日。除了周五在志愿者协会，其余四天肖群都在大平保险公司上班。上周没有法定休假日。因此，上周的周一、周二、周三和周四肖群一定在大平保险公司上班。
以下哪项是上述论证所必须假设的?（　）

参考答案：

答案解析：

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