How often does your mother go shopping? 是正确的，对twice a week 提问也就是对频率的提问。哪里不明白可以问，望采纳~~
How often does your mother go shopping?就这个了，没问题的！肯定对！我做过几十遍了！
How often does your mother go shopping ?
How often does your mother go shopping?
How often does your mother go shopping？你妈妈隔多久去购物一次？
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