问题描述：
关于always/usually/often的用法
the opera's dialogues and songs were made in the local dialect.Though i did not understand every line,i enjoyed the music in the open air.______,to celebrate big days such as Spring Festival or the Mid-Autumn Festival,operas are put on to entertain local people.
A Still B Always C Often D Usually
the opera's dialogues and songs were made in the local dialect.Though i did not understand every line,i enjoyed the music in the open air.______,to celebrate big days such as Spring Festival or the Mid-Autumn Festival,operas are put on to entertain local people.
A Still B Always C Often D Usually
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