No matter how frequently the works of Beethoven always attract a large number of people.A

问题补充：

No matter how frequently the works of Beethoven always attract a large number of people.

A. performing

B. performed

C. to be performed

D. being performed

答案：

A. performing

(答案→)B. performed

C. to be performed

D. being performed

解析：B 在让步，时间等状语从句中，如果主从句中主语一致，从句中谓语含 be动词，可以将从句中的主语和 be 省略，即在how 后加they(the works) are，再分别与选择项搭配后，就会发现正确答案是B。