hear sb do sth = sb be heard to do sth （变成被动语态时不定式要还原）
另外,hear sb doing sth = sb be heard doing sth (指动作正在进行）不可能是 to be playing ...
根据句意‘经常被听到弹钢琴’ 不是正在进行的动作,故是 to play the piano
英语单选题如下：-----What did he do in the middle of the night?-----
2个回答
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