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！

您可能感兴趣的试题

Who are Doctor Seuss and Theodore Geisel？A．They are the same person.B．One is a doctor and

答案解析
What is the tour for today mainly about？A．Urban fire fighting.B．American fire fighting inn

答案解析
Funding public transit is one of the biggest problems facing cities today. Often the tro

答案解析
Which of the following is NOT an American magazine？A．Reader"s Digest.B．USA Today.C．Newswee

答案解析
There is only one kind of family on planet Earth today: it is the traditional extended

答案解析
Which one is NOT true according to the article？（More than one correct answer)A.Today,

答案解析
One of the most authoritative voices speaking to us today is of course the voice of the

答案解析