-_ _does he have a music class?- Tweice a week

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-__doeshehaveamusicclass?-Tweiceaweek-__doeshehaveamusicclass?-Tweiceaweek-__doeshehaveamusicclass?-

-_ _does he have a music class?- Tweice a week
-_ _does he have a music class?- Tweice a week

-_ _does he have a music class?- Tweice a week
how often 多久,表示频度