自从开始新工作后,他开心多了。

自从开始新工作后,他开心多了。

He's been much happier since he started his new job.

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He's been much happier since he started his new job.

since 在这里是连词,表示"自从...以来",用来引出时间状语从句,说明主句动作或状态开始的时间点。

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