问题描述：
一个小小的英语问题：students learn their lessons in class.they sit in the classroom listening to
students learn their lessons in class.they sit in the classroom listening to the teacher carefully.这儿listen为什么要加ing呢?
students learn their lessons in class.they sit in the classroom listening to the teacher carefully.这儿listen为什么要加ing呢?
问题解答：
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