问题

Today the American doctor is one of the foremost heart－transplant surgeons in the world, _

Today the American doctor is one of the foremost heart-transplant surgeons in the world, ______tens of such operations each year.

A．to perform

B．performing

C．to performing

D．perform

请帮忙给出正确答案和分析，谢谢！

参考答案

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