do you know our town at all?--no,this is the first time I have been here 为什么用have been

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doyouknowourtownatall?--no,thisisthefirsttimeIhavebeenhere为什么用havebeendoyouknowourtownatall?--no,thi

do you know our town at all?--no,this is the first time I have been here 为什么用have been
do you know our town at all?--no,this is the first time I have been here 为什么用have been

do you know our town at all?--no,this is the first time I have been here 为什么用have been
It is the first time that …… 后面跟have/has done
It was the first time that …… 后面跟 had done~
固定用法吧~