They are having a lesson.
They must have a meal.
They must have a holiday.
What are they doing?用（a lesson) 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)该怎么 回答
What must they do?用（a meal)回答
What must they do?用（a holiday)回答
英语人气：258 ℃时间：2019-12-23 10:13:17
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