The students go out for a trip twice a year.对划线部分twice a year提问_ __ the students go out for a trip?

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Thestudentsgooutforatriptwiceayear.对划线部分twiceayear提问_______thestudentsgooutforatrip?Thestudentsgoout

The students go out for a trip twice a year.对划线部分twice a year提问___ __ __ the students go out for a trip?
The students go out for a trip twice a year.对划线部分twice a year提问
___ __ __ the students go out for a trip?

The students go out for a trip twice a year.对划线部分twice a year提问___ __ __ the students go out for a trip?
How often do
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