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

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Thegirlwasoftenheard__(toplay/play)thepianointhenextroom.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

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
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

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
to play 这要看其后跟的什么

加原型 play