—It's seond time that I__shanghai---What geat changes!It's ten years since I ——it last timehave been;left 我选的是come :had left为什么

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—It's seond time that I__shanghai---What geat changes!It's ten years since I ——it last timehave been;left 我选的是come :had left为什么
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—It's seond time that I__shanghai---What geat changes!It's ten years since I ——it last timehave been;left 我选的是come :had left为什么
—It's seond time that I__shanghai
---What geat changes!It's ten years since I ——it last time
have been;left
我选的是come :had left为什么

—It's seond time that I__shanghai---What geat changes!It's ten years since I ——it last timehave been;left 我选的是come :had left为什么
这个就是短语的用法吧,it is +一段时间 后面要用完成时,所以用have been ,而it is since +一段时间+过去式,这些差不多都是语法规定,记住就可以了.