题目

No matter how frequently _______, the works of Beethoven still attract people all over the world.    A. performed   B. performing   c. to be performed   D. being performed 答案：A 解析: 动词perform跟它的逻辑主语the works of Beethoven的关系是被动关系，frequently（经常）明确它的状态是一般式，因此选A。

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