The children_____once______(teach)to play the piano.
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Thechildren_____once______(teach)toplaythepiano.Thechildren_____once______(teach)toplaythepiano.Thec
The children_____once______(teach)to play the piano.
The children_____once______(teach)to play the piano.
The children_____once______(teach)to play the piano.
The children(were ) once (taught )to play the piano.
一般过去时的被动语态
翻译：孩子们曾经被教学弹钢琴.
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