答案是C：
是动词的用法,如果是was heard(听见),那么肯定是singing.
这句话谓语是listen to 的被动语态,第一个to 是介词,是listen 要求的.之后的解释是：歌手被（人们）听着去唱歌,是listen to sb.to do something.变成被动
( )The famous singer was listened _______in the next room.
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