[单项选择]He worked hard to perfect his craft, and before his 20th birthday, he added the tympani, marimba and xylophone to his repertoire.（）
A. 他训练非常刻苦，不断提高自己的技艺，在二十岁生日之前，就将定音鼓、立奏木琴、柔音木琴等演奏加入了他的保留节目单。
B. 他努力训练，不断完善自己的技术，在二十岁前，就在原有的乐器种类里增加了定音鼓、立奏木琴、和柔音木琴。
C. 他刻苦努力以提高自己的技艺，不到20岁，就把定音鼓、马林巴琴和木琴加入了他的全部器乐曲目中。
D. 他非常刻苦，努力完善自己的演奏技巧，没到20岁，除了原来就会演奏的乐器之外，还能熟练演奏定音鼓、马林巴琴、柔音木琴等乐器。

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