你的句子在我印象里是新概念英语第二册中的,需告诉你的是：该篇文章全文用的是一般过去时描述,因而你的句子用了过去完成时就很正常了.否则单纯这一句子在没有上下文联系的情况下肯定是一般过去时.
确保正确,
iin a few years the small workshop had become a large factor
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