______the piano well is not easy for him A Play B To play C Plays D To playing

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______the piano well is not easy for him A Play B To play C Plays D To playing

______the piano well is not easy for him A Play B To play C Plays D To playing
______the piano well is not easy for him A Play B To play C Plays D To playing

______the piano well is not easy for him A Play B To play C Plays D To playing
B
做主语成分,不能用动词.to playing语法不对

选B,不定式做主语

B 动词不定式作主语

B,动词不定是做句子的主语