书上说since不与瞬间动词连用,那it's 2 years since he left his hometown为什么对?

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书上说since不与瞬间动词连用,那it's 2 years since he left his hometown为什么对?

书上说since不与瞬间动词连用,那it's 2 years since he left his hometown为什么对?
书上说since不与瞬间动词连用,那it's 2 years since he left his hometown为什么对?

书上说since不与瞬间动词连用,那it's 2 years since he left his hometown为什么对?
原句转换成he has left his hometown since two years before .
这是现在完成时.现在完成时无瞬间动词.

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