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he said that he ```` to canada a few years ago a had been to b have been to c went d 老实说选a 为什么不能用went 还有 to to 不是多了一个to吗?

题目详情
he said that he ```` to canada a few years ago a had been to b have been to c went d
老实说选a 为什么不能用went 还有 to to 不是多了一个to吗?
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答案和解析
那就对了.had been to 已经移居