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

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

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问题 Today the American doctor is one of the foremost heart-transplant surgeons in the world, ______tens of such operations each year.
选项 A、to perform
B、performing
C、to performing
D、perform
答案B
解析 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the American doctor，所以用现在分词。
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