问题描述：
The girl was often heard __(to play/play)the piano in the next room.
顺便问一下,被动的hear和look之类的动词,有often和主动语态一样加原型还是要加to之类的
顺便问一下,被动的hear和look之类的动词,有often和主动语态一样加原型还是要加to之类的
问题解答：
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