He worked at school for three years.He came to our school.（合并句子）
He had worked at school for three years before he came to our school.
He had worked at school for three years before he came to our school.

【答案】He had worked at school for three years before he came to our school.

【解答】

【点评】

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发布：2024/4/20 14:35:0组卷：0引用：1难度：0.5

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He worked at school for three years.He came to our school.（合并句子）He had worked at school for three years before he came to our school.He had worked at school for three years before he came to our school.