大神帮忙啊：PREP 12 SC

wanqiu.beijing

Since digital recording offers essentially perfect reproduction—on compact discs, digital audiotapes, or digital videodiscs—audiophiles can accumulate vast collections of music, transferring them from one format to another, copying it, and digitally altering it with little effort and not damaging the sound quality.
A  music, transferring them from one format to another, copying it, and digitally altering it with little effort and not damaging  
B  music, transferring it from one format to another, copying it, and digitally altering it with little effort and no damage to
C  music, transferring them from one format to another, copy them, and digitally alter them with little effort and no damage to
D  music and transfer it from one format to another, copy it, and then digitally altering it with little effort and not damaging
E  music and transfer it from one format to another, copying it, and digitally alter it with little effort and no damage to
请问划线部分的代词（them/it），到底指代的是什么，我觉得指代的是vast collections。

fxxxfxxx

正确答案里并没有them啊

wanqiu.beijing

fxxxfxxx 发表于 2017-7-22 19:36
正确答案里并没有them啊

正确答案：B， 我就是不知道为何用的是it, 而不是them.

fxxxfxxx

wanqiu.beijing 发表于 2017-7-22 19:39
正确答案：B， 我就是不知道为何用的是it, 而不是them.

如果应该用的是them那后面的it又是什么呢

这里所有的描述都是在说一个东西，如何accumulate collections of music，后面所有的ing都是在解释这件事，也就是说by tranfering music，copying music，and altering music
A除了them的问题也不平行，这里只有B选项是平行的表述