My sister used to like dancing,but now she is fond of playing the violin.
is删掉~
be used to sth习惯了某物
be used to doing sth 习惯了做某事
（used to do sth 过去常常做某事
be used to do sth被用来做某事）
My sister used to like dancing,but now she is fond of playing the violin。
前面的is应该去掉，be used to(介词) doing是“习惯于做某事”，曾经应该是used to do
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