坯体增强剂:翻译 I have been able to sign important new agreements which will lead to further practical outcome

翻译 I have been able to sign important new agreements which will lead to further practical outcome 译: I have been able to sign important new agreements which will lead to further practical outcome I have been studying history in China怎么翻译 I would have been drowned . I HAVE Never Been To Me I have been to shanghai 什么时态 I have been working here ____ years. 请问一下I have been to shanghai 请问一下I have been to shanghai I have been to England什么意思