He is said to have been working in that factory for twelve years.这里动词不定式是作状语吗?

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• He is said to have been working in that factory for twelve years.这里动词不定式是作状语吗?
• He is said to have been working in that factory for twelve years.这里动词不定式是作状语吗?
• He is said to have been working in that factory for twelve years.这里动词不定式是作状语吗?
• He is said to have been working in that factory for twelve years.这里动词不定式是作状语吗?
• 英语翻译速求
• have been to 能用一段时间做状语吗?如标题：have been to, have gone to, have been in 在意思上的区别我知道,但是它们的时间状语呢?have been in 肯定是接一段时间的,have been to 肯定能接次数的,但 have been to 和 have gone to 能不能接一段时间呢?比如：要表达“我曾经去过美国三年（现在不在美国）”是不是I have been to the USA for 3 years. 如果不是又该怎样说呢?那“他去北京已经三天了”是不是 He has gone to Beijng for 3 days 呢?