We should feed them once a week.you them?(you前有3格,them前有一格,对划线部分提问,画线部分为once a week)

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We should feed them once a week.you them?(you前有3格,them前有一格,对划线部分提问,画线部分为
once a week)

如果划线部分是once a week 表频率那么应该用对频率提问的词组how often
正解是 How often should you feed them?

How often do feed