题目内容
The students who are studying in the classroom pay attention to listen to their teacher.listen →listening
解析：pay attention to中的to是介词，接动词时要用动词的-ing形式。
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题目内容
The students who are studying in the classroom pay attention to listen to their teacher.listen →listening
解析：pay attention to中的to是介词，接动词时要用动词的-ing形式。