I have been to Beijing before.______A So do i B SO had i C SO have i D SO did I

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IhavebeentoBeijingbefore.______ASodoiBSOhadiCSOhaveiDSOdidIIhavebeentoBeijingbefore.______ASodoiBSOh

I have been to Beijing before.______A So do i B SO had i C SO have i D SO did I
I have been to Beijing before.______
A So do i B SO had i C SO have i D SO did I

I have been to Beijing before.______A So do i B SO had i C SO have i D SO did I
C
表示说话者也适用上述情况,用so + be/have/has/情态动词+主语
答句可转换成:I have been to Beijing before, too. 故用have
若此题改为:I had been to Beijing . 答句用SO had i (=I had been to Beijing, too.)
若此题改为:I went to Beijing . 答句用SO did i (=I went to Beijing, too.)

D

c
前面用的是现在时态 所以后面也要一致 用助动词have