Wangtao goes to Shanghai visit her daughter once a month…对+once a month提问

问题描述:

Wangtao goes to Shanghai visit her daughter once a month…对+once a month提问
her改为his

How often does Wangtao go to Shanghai visit his daughter?
对频度提问用how ofter,王涛多久去上海看望他女儿一次?