在主动语态中.感官动词（如see、heard等）后的动词用三种1.原形2.动名词（表示正在进行） 3.动词过去分词（表示宾语的被动） 结构为：感官动词+宾语+三种动词结构.其中to 是被省略的.
而在被动语态中.要把to还原.
则：感官动词+宾语+三种1.to do 2.to be doing 3.to be done
根据你的句子.指的是被动语态中的第一种情况.
所以用B.
The girl was often heard ( ) happily in her room.
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