the other day 是固定搭配,本身可用作状语,其前不用介词。如:
I saw your friend the other day. 前几天我见到你的朋友。
What about that matter the other day? 早几天的那件事怎么样了?
We spoke on the phone the other day. 我们几天前还通过电话。
I got an email from Jim the other day. 早几天我收到吉姆一封电子邮件。
I happened upon her in the street the other day. 几天前我在街上碰巧遇见了她。
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