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
人气：262 ℃ 时间：2019-12-23 10:13:17
解答
They are having a lesson.
They must have a meal.
They must have a holiday.
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