在我到达学校之前，我意识到我把背包放到家里了。
Before I got to school, I realized I had left my backpack at home.
当我到达学校的时候，我意识到我把背包忘在家里了。
When I got to school, Irealized I had left my backpack at home.
当她到达学校的时候，她意识到她把书包忘在家里了。
When she got to school, she realized she had left her backpack at home.
当我到达学校时，我才意识到我把背包放在家里了。
When I got to school, I realized I had left my backpack at home.
当我到达学校时，我才意识到我把背包忘在家里了。
When I got to school, I realized I had left my backpack at home.
当我到达学校时，我才意识到我把背包忘在家里了。
When I got to school, I realized I had left my backpack at home.
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