一些学生会忘了在操场上集合。
发出一项命令，所有学生在上午9点集合起来。
An order wqas sent forth that all the students he assembled at 9 am.
老师到的时候，学生们已经在操场上集合好了。
When the teacher arrived, the students had got together on the playground.
老师到的时候，学生们已经在操场上集合好了。
When the teacher arrived, the students had got together on the playground.
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