A have有两种词性,助动词和实意动词；
助动词是用来构成各种时态的,比如do；
实意动词就是我们平时见的很多的动词；
have后面加了not的话表示此时作为助动词,那么这一句就没有动词了,所以句子是不完整的；
C表示正在进行,更具语义是不合适的；
They ___ mp3s when my mother was a student.
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