Have you been to Shanghai?Yes,I ( )therefor 3 days last mont

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Have you been to Shanghai?Yes,I ( )therefor 3 days last month.答案是havebeen用 have been还是was
网上有的人说用havebeen有的人说用was,究竟哪个?如果用havebeen,后面不是有last month吗?现在完成时态不是不能和last month连用的吗?如果用was,那和前面的问题不是不对应了吗?

was,有了last month这个过去的时间点就不能用现在完成时了.
用了was并不是和前面的问题不对应,只是换种说法而已：
你曾经去过上海吗?——是的,我上个月在那里（上海）待了（停留了）三天

Have you been to Shanghai?Yes,I ( )therefor 3 days last mont Have you ever been to Shanghai?Yes,I （）there for three days —Have you ever been to Shanghai,Mary?—Yes,I _____ there last -have you been to shanghai?-yes,i went there last spring --Have you ever been to shanghai?---Yes.I ____there a few mo --Have you ever been to Shanghai?-Yes.I ___there a few month Have you ever been to Shanghai?Yes.I ____ there a few month Have you ever been to Shanghai ,Mary?-Yes,I ( ) there for th Have you ever b____ to shanghai ? yes, I w______there last y 1.Have you even been to a wedding ceremony?Yes,I have.Last m I have been to shanghai,I__________there last month -Have you been to West Lake?-Yes,I ____ there last summer.A.