Today the American doctor is one of the foremost heart-transplant surgeons in the world _
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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!
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正确答案:B
本题考查非谓语动词的用法,据题意,现在这位美国医生是世界上最重要的心脏移植外科医生之一,每年做数十例这种手术。分词的逻辑主语也是theAmericandoctor,所以用现在分词。
