问题描述：
一道非谓语的选择题
____ at first to accomany dancing,the violin was considered an instrument of low social status.
A.Being used B.Having been used C.Used
选哪一个?别的为什么不对?
____ at first to accomany dancing,the violin was considered an instrument of low social status.
A.Being used B.Having been used C.Used
选哪一个?别的为什么不对?
问题解答：
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