关键点是：after为介词,介词后面如果用动词,只能用动词的现在分词形式,即doing.
第一句话中,after后面要直接跟动词listen,所以只能用动词现在分词形式,listening;
第二句话中,after后面跟的是一个完整的句子,后面接的是主语they.一个完整的句子就用they listen to it.
after doing s.th还是after do s.th?
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