I lesson on Wednesday afternoon.A. play pianoB. play a pianoC. have pianoD. have a piano

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A. play piano
B. play a piano
C. have piano
(答案→)D. have a piano
解析：句意：在周三下午，我上了一节钢琴课。英语中lesson是可数名词，play是演奏的意思，故前文加不定冠词a，选D。