Have you ever been to Shanghai?Yes,I ()there for three days last month.为什么选have been

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Have you ever been to Shanghai?Yes,I ()there for three days last month.为什么选have been
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Have you ever been to Shanghai?Yes,I ()there for three days last month.为什么选have been
Have you ever been to Shanghai?Yes,I ()there for three days last month.为什么选have been

Have you ever been to Shanghai?Yes,I ()there for three days last month.为什么选have been
的确选 have been
这句话的意思是:你曾去过上海吗?是的,我上个月呆了三天
判断这道题答什么,首先明确这是什么时态,是现在完成时,表示过去对现在影响.
其次,你要注意问题是用什么问的(have been),所以你也要用have ever been来回答!

提问为现在完成时,故选择现在完成时作为回答

选have been是错的,应该用WAS

现在完成时语法。