i used to return home (at least twice a year).对划线部分提问

问题描述:

i used to return home (at least twice a year).对划线部分提问

How often did you use to return home?
理由:
at least twice a year (至少每年2次)表示频率.那么问频率,就用how often 开头.
句子意思:你过去常常多久回家?
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