[請益] on a Saturday???
我只聽過on Saturdays（每個星期六）的用法，是搭配現在簡單式。
可是我在聽多益口說一題問：How often do you shop??
模擬回答：I shop once a week, usually on a Saturday.
（我一星期購物一次，通常在星期六）
用goole 搜尋on a Saturday，沒結果。在此發問一下。
謝謝回答。
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