第24题: [单项选择]No matter how frequently ______ , the works of Beethoven always attract large audiences. A. performing B. performed C. to be performed D. being performed 参考答案:B 答案解析:本句的意思是:尽管贝多芬的作品经常被演奏,它们还是吸引大批听众。本句是一个复合句,从句是由no matter引导的让步状语从句。完整的从句应是:No matter how frequently the