He was often listened ------ in the next room.A.sing B.sung

注意这里的被动语态.很多时候做选择题要善于将句子还原 你就能更容易找到答案.
把这里的被动还原：people often listened to him to sing in the next room.
所以改成被动就变成：he was often listened to to sing in the next room