小号指法视频:IV.句型变化
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句型变化（提问）
Mr Wang has taught at NO.1 middle schoolsince he became a teacher.
_____ _____ has Mr Wang _____at NO.1 middle school?
Mr Wang has taught at NO.1 middle schoolsince he became a teacher.
_____ _____ has Mr Wang _____at NO.1 middle school?
How long taught
How long ,taught
How,long,taught