问题描述：
She has been dancing for two years.对划线部分提问 ___ ____ has shen been dancing __________
2,She has been working for 20 hours.改为一般疑问句
2_____she _____ ____for 20 hours?
2,She has been working for 20 hours.改为一般疑问句
2_____she _____ ____for 20 hours?
问题解答：
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