Whatdidhedointhemiddleofthenight？Well，I'mnotsure，buthewasoftenhe

发布时间：2020-08-07 04:22:19

What did he do in the middle of the night？Well，I'm not sure，but he was often heard ________．A.playing the pianoB.to play pianoC.play the pianoD.to be playing piano

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A解析用现在分词作补足语；piano前应用the。
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