No matter how frequently ______, the works of Beethoven always attract large audience.
【正确答案】 B
【答案解析】考查非谓语动词的用法。由于句子的主语the works of Beethoven与动词perform存在被动关系,而且没有强调“将来”(to be performed)或“正在进行”(being performed)的意味,故B为最佳答案。