作业帮how long____you____(be)in the city?
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how long____you____(be)in the city?
how long____you____(be)in the city?
how long____you____(be)in the city?
have been
how long have you been in the city?你来这个城市多久了
have been
现在完成时。
how long have you been in the city?
how long have you been in the city?你来这个城市多久了？
have been
现在完成时。