What are they doing?用(a lesson) 回答What are they doing?用(a lesson)该怎么 回答What must they do?用(a meal)回答What must they do?用(a holiday)回答

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What are they doing?用(a lesson) 回答What are they doing?用(a lesson)该怎么 回答What must they do?用(a meal)回答What must they do?用(a holiday)回答
What are they doing?用(a lesson) 回答
What are they doing?用(a lesson)该怎么 回答
What must they do?用(a meal)回答
What must they do?用(a holiday)回答

What are they doing?用(a lesson) 回答What are they doing?用(a lesson)该怎么 回答What must they do?用(a meal)回答What must they do?用(a holiday)回答
They are having a lesson.
They must have a meal.
They must have a holiday.

They are having a lesson

They are having a lesson.
They must have a meal.
They must be on a holiday.