i always listened to the girl ____(read)english books in the playgroud

问题描述:

i always listened to the girl ____(read)english books in the playgroud
答案是read但是是为什么呢?

listened to是感官系动词
感官系动词的用法:
listen to sb do sth (听到某人经常做某事,出现always时用)
listen to sb doing sth(听到某人正正在做某事)